posture ↑ 9.9 posture

Open-Source

Score 40.1 / 100 1161 providers 333 APIs Search apis.io →

Variants seen in the corpus: Open SourceOpen-SourceOpenSourceOpensourceopen sourceopen-source

Providers using this tag (1159)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 20 Complete, well-documented, and agent-ready

MedplumHealthcareFHIRDeveloper Platform4 APIs91.3 RudderStackCustomer Data PlatformCDPData Pipeline13 APIs80.2 SvixWebhookWebhooks As A ServiceWebhook DeliveryWebhook Sending21 APIs79.2 SwetrixAnalyticsCookieless TrackingGDPR Compliant13 APIs78.6 Adobe CampaignCampaign ManagementCustomer ExperienceEmail MarketingMarketing Automation20 APIs77.3 Canvas LMSLearning ManagementEducationEdTechLMS16 APIs76.2 NextGen HealthcareHealthcareUnited StatesEHREMR9 APIs75.7 GhostPublishingNewslettersMembershipsSubscription19 APIs74.4 PlunkEmailTransactional EmailMarketingAutomation5 APIs70.6 Heroic LabsGame BackendMultiplayerReal-TimeWebSocket4 APIs70.4 PostizSocial-MediaSchedulingContent9 APIs69.4 Virto CommerceB2B E-CommerceCatalog ManagementOrder ManagementPricing13 APIs69.1 New RelicAnalysisAnalyticsAPMDevOps41 APIs68.8 RybbitAnalyticsWeb AnalyticsProduct AnalyticsPrivacy3 APIs68.8 Solo.ioCompanyAPI GatewayService MeshKubernetes15 APIs68.4 MetriportHealthcareMedical RecordsFHIRHealth Data7 APIs68.2 MatomoAnalyticsWeb AnalyticsPrivacy61 APIs67.3 Highlight (highlight.io)ObservabilitySession ReplayError MonitoringAPM8 APIs66.7 AirbyteData IntegrationETLELT44 APIs66.6 NovuNotificationMessagingIn-AppEmail19 APIs66.6

Strong 37 Solid coverage with minor gaps

E2BArtificial IntelligenceAgentsCode ExecutionCode Interpreter14 APIs65.7 GiteaGitSource ControlDevOpsCI/CD13 APIs65.5 DaytonaArtificial IntelligenceAgentsCloudCode Execution28 APIs65.2 HyperbolicArtificial IntelligenceComputeDecentralizedDePIN6 APIs64.7 RefuelArtificial IntelligenceLLMData LabelingData Enrichment3 APIs64.6 BonitasoftCompanySoftware-as-a-ServiceBusiness Process ManagementProcess Automation1 API64.1 UmamiCookieless TrackingPrivacyWeb Analytics7 APIs63.3 PlausibleAnalyticsCookie-FreeEvent TrackingGDPR8 APIs62.9 IBMAPI ManagementArtificial IntelligenceBillingCloud Computing55 APIs62.6 Microsoft Azure QuantumQuantumQuantum ComputingAzureMicrosoft8 APIs62.6 ErxesGraphQLCRMCustomer Experience1 API62.2 RedoxCompanyHealthcareInteroperabilityFHIR5 APIs62.1 PingCAPDistributed SQLDatabasetidbhtap32 APIs61.4 ArcadeAgentsMCPAI AgentsAuthorization11 APIs60.8 Google Quantum AIQuantum ComputingQuantumHardwareNISQ15 APIs59.3 Fasten HealthHealthcareFHIRPersonal Health RecordElectronic Medical Record11 APIs59.2 Red HatCloudContainersEnterpriseHybrid Cloud75 APIs59.1 ETSITelecommunicationsFranceStandardsStandards Body24 APIs58.4 LichessChessGamesNon-Profit23 APIs58.1 Swagger CodegenClient LibrariesCode GenerationOpenAPI5 APIs58.1 TykAPI GatewayAPI ManagementGraphQL39 APIs57.7 ThingsBoardIoTInternet of ThingsDevice ManagementTelemetry58 APIs57.6 Poggio LabsCompanyArtificial IntelligenceRevenue IntelligenceSales4 APIs57.4 TimescaleCompanyDatabasePostgreSQLTime Series12 APIs57.2 The Trade DeskAdvertisingProgrammatic AdvertisingDemand-Side PlatformDSP9 APIs56.9 AutomatticCompanyContent ManagementPublishingBlogging9 APIs56.8 InsforgeCompanyBackend-as-a-Serviceagent-nativeCloud Infrastructure11 APIs56.4 TetherCompanyStablecoinsCryptocurrencyBlockchain5 APIs56.4 SupaglueCRMHRISUnified-API40 APIs56.3 DubLink ManagementURL ShortenerAnalyticsConversion Tracking18 APIs56.1 GoatCounterAnalyticsPage ViewsPrivacyStatistics6 APIs56.0 Crowd.devCompanyCommunityDeveloper RelationsDeveloper Data Platform16 APIs55.3 FleetCompanyDeveloper ToolsDevice ManagementMDM1 API55.1 Prime IntellectArtificial IntelligenceReinforcement LearningGPU ComputeDecentralized Compute20 APIs55.1 YugabyteCompanyDatabaseDistributed SQLPostgreSQL10 APIs55.1 KubernetesAutomationCloud-NativeCNCFContainers7 APIs55.0 KubeshopCompanyTestingKubernetesContinuous Integration30 APIs54.4

Developing 205 Usable, with meaningful gaps to close

Thin 411 Limited public surface area

Emerging 370 Early or largely undocumented

Minimal 116 Almost no public developer surface

APIs with this tag (329)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 5 Complete, well-documented, and agent-ready

Svix Open Source Server APIThe self-hostable open source Svix server (svix-webhooks repo). Smaller surface area than the hosted produc...79.2 Adobe Campaign Classic JavaScript SDKAn open-source JavaScript SDK that wraps Adobe Campaign Classic SOAP APIs in a simple, expressive, JavaScri...77.3 NextGen Mirth Connect Integration Engine APIAPI for NextGen Mirth Connect, an open-source healthcare integration engine supporting HL7 v2, FHIR, and ot...75.7 New Relic Telemetry SDKsThe New Relic Telemetry SDKs are open source client libraries for sending metrics, events, logs, and traces...68.8 Highlight Self-Hosted DeploymentSelf-hosted deployment of the open-source Highlight stack. Three tiers — Dev (single-host docker-compose), ...66.7

Strong 19 Solid coverage with minor gaps

Refuel Autolabel (Open Source)Autolabel is the open-source Python library (pip install refuel-autolabel) to label, clean, and enrich text...64.6 IBM watsonx.dataCollect, store, query, and analyze structured and unstructured enterprise data with a unified data lakehous...62.6 Q# Quantum Programming LanguageQ# is Microsoft's open-source, hardware-agnostic quantum programming language. The Modern QDK compiler is w...62.6 Redox HL7 v2 Libraryredox-hl7-v2 is Redox's open-source JavaScript library for parsing and generating HL7 v2 messages, useful f...62.1 Arcade MCP FrameworkThe arcade-mcp open-source Python framework — "MCP Server Framework and Tool Development library for buildi...60.8 CirqCirq is an Apache 2.0 Python framework for designing, manipulating, simulating, and executing Noisy Interme...59.3 OpenFermionOpenFermion is an Apache 2.0 library for translating quantum chemistry and materials science problems (elec...59.3 qsimqsim is a high-performance C++ state-vector simulator with a Python (qsimcirq) binding that plugs directly ...59.3 QualtranQualtran provides abstractions (Bloqs) for expressing, decomposing, and resource-estimating fault-tolerant ...59.3 ReCirqReCirq is a research-grade collection of reproducible Cirq experiments and applications published by Google...59.3 StimStim is a fast stabilizer-circuit simulator and detector-error-model toolchain that underpins Google Quantu...59.3 TensorFlow QuantumTensorFlow Quantum (TFQ) is a hybrid quantum-classical machine learning library that integrates Cirq circui...59.3 Tesseract DecoderTesseract is a search-based maximum-likelihood decoder for quantum error correction that accompanies Stim. ...59.3 UnitaryUnitary is an API library for adding quantum behaviours (superposition, entanglement, measurement) into cla...59.3 Fasten OnPremFasten OnPrem is an open-source, self-hosted, personal and family electronic medical record manager written...59.2 Goalkeeper APIOpen-source (Apache-2.0) REST API for Goalkeeper, Poggio Labs' durable-goals record for teams of people and...57.4 Goalkeeper MCP ServerStateless Streamable HTTP MCP service shipped with Goalkeeper, exposing 11 tools for creating and reading g...57.4 Unified ID 2.0 (UID2)Unified ID 2.0 is an open-source, deterministic identity framework seeded by The Trade Desk and now governe...56.9 WordPress.com REST API - wp/v2 namespaceThe WordPress core REST API shape as served by WordPress.com, site-scoped at /wp/v2/sites/{site}/. 348 oper...56.8

Developing 51 Usable, with meaningful gaps to close

AURA Agent FrameworkMezmo's open-source agentic orchestration framework. Apache 2.0 Rust framework for composing AI agents from...53.7 Mezmo Agent (logdna-agent-v2)Open-source Rust log collection agent (logdna-agent-v2). Tails files, journald, and Kubernetes pod logs and...53.7 Qubership APIHUB Registry APIThe external, public-facing API contract for APIHUB — Netcracker's open-source API registry and developer p...52.8 Qubership APIHUB System Administrators APIThe external administration API contract for APIHUB, covering technical administration operations — package...52.8 Qubership DBaaS Aggregator APIThe REST API for Qubership DBaaS, Netcracker's open-source Database as a Service aggregator. It collects re...52.8 Qubership MaaS (Messaging as a Service) APIThe REST API for Qubership MaaS, Netcracker's open-source messaging-as-a-service component that provisions ...52.8 Arazzo EngineOpen-source Python engine that executes Arazzo workflow specifications alongside OpenAPI operation definiti...51.8 Jentic API AI-Readiness Framework (JAIRF)Technical specification for evaluating how interpretable, operable, and trustworthy an API is for AI system...51.8 Jentic MiniFree, open-source, self-hosted API execution layer that sits between an agent and the outside world. The ag...51.8 Jentic Standard AgentOpen-source composable reasoning agent framework that plans, acts, and recovers from failures, preconfigure...51.8 Kong GatewayKong Gateway is the open-source, lightweight, cloud-native API gateway optimized for microservices, deliver...51.2 Kong InsomniaKong Insomnia is an open-source API development platform for designing, debugging, and testing APIs. It sup...51.2 Penn Medicine Open Source Health InformaticsPenn Medicine and the Perelman School of Medicine publish open-source health-informatics software across se...51.2 OpenZeppelin Contracts API ReferenceThe OpenZeppelin Contracts library provides a comprehensive collection of modular, reusable, and secure Sol...50.0 OpenZeppelin Monitor APIOpenZeppelin Monitor is an open-source blockchain monitoring service that watches for specific on-chain act...50.0 Continue CLIOpen-source command-line interface powering Continue's source-controlled AI checks. Checks are markdown fil...49.4 Continue IDE ExtensionsOpen-source IDE plugins shipping for VS Code and JetBrains. Provide chat, edit, apply, autocomplete, and ag...49.4 Odin MCP ServerFirst-party Model Context Protocol server (stdio transport) published by Dream Horizon that exposes Odin — ...48.2 AWX APIAWX is the open-source upstream project for Ansible Automation Platform, providing a web-based UI, REST API...47.9 Gravitee Kafka GatewayThe Gravitee Kafka Gateway brings full API management discipline to Apache Kafka. It sits in front of one o...47.2 Gravitee Kubernetes OperatorThe Gravitee Kubernetes Operator (GKO) is a Go-based Kubernetes operator that lets platform teams declare G...47.2 Tuva EMPI APIThe HTTP API of Tuva EMPI, Tuva Health's open-source (Apache-2.0) enterprise master patient index. A contai...47.0 Telegram TDLib (Telegram Database Library)TDLib is a cross-platform, fully functional Telegram client library for third-party developers. TDLib takes...46.9 Hugging Face Transformers LibraryOpen-source Python library that provides pretrained models, tokenizers, and pipelines for inference and fin...45.3 Streamlit Python APIThe Streamlit Python library API provides a rich set of functions for building interactive data application...45.0 CoolifyThe Coolify platform - an open-source, Apache-2.0 licensed, self-hostable PaaS written in PHP (Laravel) tha...44.9 RPA FrameworkThe RPA Framework is an open-source collection of Python libraries for robotic process automation designed ...44.5 Lance FormatApache 2.0 open lakehouse format for multimodal AI. Columnar Parquet replacement offering 100x faster rando...44.2 Parallax Evaluation APISelf-hosted HTTP API of Parallax, the Apache-2.0 runtime security engine Scalarr publishes for AI agents. T...43.8 Open-Source LibraryThe original open-source cleanlab Python library for data-centric AI - finds and fixes label errors, outlie...43.6 Pocket Network PATH Gateway APIPATH (Pocket API and Toolkit Harness) is an open-source framework for deploying permissionless gateways on ...43.1 OpenInferenceOpenInference is Arize's open-source set of OpenTelemetry conventions and instrumentation libraries for LLM...43.0 PhoenixPhoenix is Arize's open-source LLM observability platform offering local tracing, evaluation, experiments, ...43.0 TimeFusion (Timeseries Engine)Rust-based timeseries database for events, logs, traces, and metrics using a PostgreSQL dialect over S3 / D...42.9 Surge Python SDKOfficial Python SDK (surge-api on PyPI) wrapping the Surge API. Requires Python 3.10+, MIT-licensed, and la...42.5 Quix Streams (Open Source)Apache 2.0 open source Python library (pip install quixstreams) for building containerized stream-processin...42.1 Ansible Semaphore APIAnsible Semaphore is an open-source modern web UI and REST API for running Ansible playbooks. It provides p...41.7 AWX APIAWX is the open-source upstream project for Ansible Automation Platform, providing a web-based UI, REST API...41.7 Signal Android SDKSignal-Android is the open-source Android client for the Signal encrypted messaging platform. It provides t...41.0 Signal Desktop SDKSignal-Desktop is the open-source desktop client for the Signal encrypted messaging platform, built with El...41.0 Signal iOS SDKSignal-iOS is the open-source iOS client for the Signal encrypted messaging platform. It delivers end-to-en...41.0 Macquarie University Library Open-Source ToolingThe Macquarie University Library publishes public open-source utilities on GitHub that integrate with the E...40.8 Medusa Core RepositoryMonorepo with the Medusa server, Admin, Commerce Modules, Framework, and packages. MIT-licensed reference f...40.7 Data API Builder for SQL ServerOpen-source tool that generates REST and GraphQL endpoints for SQL Server and Azure SQL databases from conf...40.5 HoppscotchHoppscotch is a lightweight open-source browser-based API client supporting REST, GraphQL, WebSockets, SSE,...40.5 Traefik MeshLightweight service mesh built on Traefik Proxy. Offers traffic management and observability for service-to...40.3 Traefik ProxyTraefik Proxy is the flagship open-source (MIT) cloud-native reverse proxy, ingress controller, and load ba...40.3 Yaegi (Go Interpreter)Embeddable Go interpreter maintained by Traefik Labs. Powers the Traefik plugin system - plugins are upload...40.3 shib-keygen-api (Shibboleth SP Metadata Tooling)Open-source utility from the Stockholm University GitHub organization that generates Shibboleth SP/SAML2 me...39.5 Emissary-IngressEmissary-Ingress is an open-source, Kubernetes-native API gateway built on Envoy Proxy and a CNCF incubatin...39.3 Rentberry Geocoder (gRPC)Open-source gRPC geocoding and timezone-lookup service Rentberry built and runs for its own property search...39.3

Thin 96 Limited public surface area

Brightlayer UI (Design System)Eaton's open-source design system and component library used to build Brightlayer applications. Ships theme...39.2 Prefect Server REST APIThe Prefect Server REST API is the self-hosted variant of the Prefect orchestration API for managing workfl...39.1 GPT4AllOpen-source ecosystem for running large language models locally on consumer hardware. Ships a desktop chat ...39.0 Saleor Core (Server) RepositorySource repository for the Saleor server - the Django / Python backend that implements the GraphQL API, busi...38.8 Lingo.dev CLIOpen-source command-line tool that localizes JSON, YAML, Markdown, CSV, and PO files in one command, tracki...38.6 Lingo.dev CompilerOpen-source build-time React localization. The Compiler detects translatable strings and generates localize...38.6 Emory Libraries Digital Repository SoftwareEmory Libraries (Library Technology and Digital Strategies) maintains a large public open-source GitHub org...38.4 Sejda ConsoleCommand-line shell over the Sejda SDK for running PDF tasks (merge, split, etc.) from a terminal or scripts...38.2 Sejda SDKOpen-source (AGPLv3) Java library for PDF manipulation - merge, split, rotate, encrypt, watermark, and more...38.2 Apache Software Foundation Projects APIThe Apache Software Foundation Projects API provides read-only access to JSON data about ASF projects, comm...38.0 GraphQL Inspector CLICommand-line tool for comparing two GraphQL schemas and generating a detailed list of breaking, non-breakin...37.8 GraphQL Mesh APIGraphQL federation framework that composes any API service — REST, OpenAPI, gRPC, SOAP, OData, JSON Schema,...37.8 GraphQL Scalars APIOpen-source TypeScript/JavaScript library providing 80+ custom GraphQL scalar types (DateTime, EmailAddress...37.8 Kubescape In-Cluster Component API (Open Source)The open-source Kubescape Operator's in-cluster components (storage, kubevuln, gateway, operator, node-agen...37.8 OP StackOpen-source, modular Ethereum L2 rollup stack. The monorepo at github.com/ethereum-optimism/optimism contai...37.7 Spree Core Repository (spree/spree)Monorepo with the Spree Rails engine, Admin, Store/Admin/Platform/ Storefront APIs, OpenAPI specs, TypeScri...37.7 DBHi Biomedical and Health InformaticsCHOP's Department of Biomedical and Health Informatics (DBHi) maintains 168 public repositories covering he...37.6 Vocode Open Source Libraryvocode-core, the MIT-licensed Python library for building voice-based LLM agents with pluggable STT, LLM, a...37.6 BentoML REST APIBentoML is an open-source unified inference platform for deploying and scaling AI models. It auto-generates...37.5 MLflow Model Registry REST APIMLflow is an open source platform for managing the ML lifecycle, including experiment tracking, reproducibi...37.5 NVIDIA Triton Inference Server HTTP APINVIDIA Triton Inference Server is an open-source inference serving software that implements the KServe Open...37.5 Ray Serve REST APIRay Serve is a scalable model serving library built on Ray, designed for building online inference APIs. Su...37.5 vLLM OpenAI-Compatible APIvLLM is a high-throughput and memory-efficient inference engine for LLMs, implementing PagedAttention for e...37.5 Orama Open Source EngineThe open-source @orama/orama library (Apache 2.0) - a complete in-memory search engine and RAG pipeline tha...37.3 Lightly Self-Supervised Learning SDK (OSS)The open-source (Apache-2.0) lightly Python library for self-supervised representation learning on images (...37.2 DaSCH DSP-APIThe DaSCH Service Platform API (DSP-API, formerly Knora), an open-source HTTP API for long-term preservatio...37.1 MOSTLY AI Synthetic Data SDKOpen-source Python SDK (mostlyai, Apache 2.0) for training generators and producing synthetic data. Runs in...36.8 PyOD (Python Outlier Detection)PyOD is a comprehensive and scalable Python library for detecting outliers/anomalies in multivariate data. ...36.7 University of Alberta Library Open Source (GitHub)The University of Alberta Library publishes open-source code through its GitHub organization (ualbertalib),...36.7 TraceeTracee is a runtime security and forensics tool for Linux that uses eBPF technology to trace system events ...36.6 TrivyTrivy is a comprehensive open source security scanner for containers, Kubernetes, code repositories, clouds...36.6 Haystack Framework (Open Source)Apache-2.0 licensed Python framework for composable LLM orchestration. Build modular Pipelines from Compone...36.5 Brave BrowserPrivacy-first Chromium-based browser for Windows, macOS, Linux, Android, and iOS, with built-in tracker and...36.4 Conductor MCP ServerConductor MCP is an official Model Context Protocol server for Orkes Conductor that exposes workflow execut...35.8 Deepchecks Open-Source TestingThe AGPL-3.0 licensed open-source Python package for continuous validation of tabular, computer-vision, and...35.8 Trieve Open Source ServerSelf-hostable Trieve server (Rust / Actix-web), dashboard, search and chat UIs, ingestion / file / delete w...35.5 Manifold Creator Core Smart ContractsOpen-source Solidity smart contract framework for deploying ERC721 and ERC1155 creator-owned NFT contracts....35.3 Manifold Royalty RegistryOn-chain smart contract registry that serves as a single source of truth for NFT royalties across all major...35.3 Stoplight CLIThe Stoplight CLI enables programmatic linting of API descriptions and pushing analysis results to the Stop...35.3 Stoplight ElementsElements is an open-source toolkit for building beautiful, interactive API documentation from OpenAPI speci...35.3 Stoplight PrismPrism is an open-source HTTP mock and proxy server that turns any OpenAPI v2/v3 or Postman Collection file ...35.3 Stoplight SpectralSpectral is an open-source JSON and YAML linter for creating automated API style guides and governance rule...35.3 Fluentd Plugin APIThe Fluentd Plugin API allows developers to write custom input, output, filter, parser, formatter, and buff...35.0 Promptfoo CLIThe Promptfoo CLI is the primary entry point for running prompt and model evaluations from the command line...34.6 BrunoBruno is an open-source API client and test suite manager that stores API collections as plain files alongs...34.2 Data API BuilderOpen source configuration-based engine that creates REST and GraphQL APIs for SQL Server, Azure SQL, Azure ...34.2 GS Quant Python ToolkitGS Quant is Goldman Sachs' open-source Python toolkit for quantitative finance, distributed on GitHub and P...34.1 Apache JMeterApache JMeter is the most widely-used open-source load testing tool. It supports HTTP, HTTPS, FTP, JDBC, LD...33.9 Gatling Load TestingGatling is an open-source load testing framework built on Akka and Netty, providing high performance with a...33.9 Locust Load TestingLocust is a scalable, distributed open-source load testing framework written in Python. Test scenarios are ...33.9 Estuary Flow ConnectorsOpen-source library of source and destination connectors for SaaS apps, databases, message queues, warehous...33.7 iBridges / Python API for iRODSOpen-source Python client libraries and tooling for interacting with iRODS research-data-management storage...33.6 Open-Source Snorkel LibraryThe free, open-source snorkel Python library (Apache-2.0) for programmatically building and managing traini...33.3 Carbone Render Engine (Open Source)Open-source Node.js library that powers the rendering engine. Embed directly in your application; render te...33.2 Open VSX Registry APIREST API for the Eclipse Open VSX Registry, an open-source alternative to the Visual Studio Marketplace for...33.0 what3words API Docs and OpenAPI RepositoryPublic repository hosting the OpenAPI specification, LLM files, and reference material for the what3words P...33.0 Opentrons Python Protocol APIThe Opentrons Python Protocol API is an open-source Python framework for writing automated biology lab prot...32.5 TaxiQL Query APITaxiQL is a declarative query language for federated data retrieval across multiple APIs and data sources. ...32.3 FiftyOne SDK (Python)The open-source FiftyOne Python SDK is the primary interface for building and curating visual AI datasets -...32.2 AnyscaleAnyscale is the production-scale AI platform built on Ray by the creators of Ray, supporting LLM inference ...31.8 Apache APISIX AI ProxyThe Apache APISIX ai-proxy plugin streamlines integration with LLMs by converting plugin settings into the ...31.8 Envoy AI GatewayEnvoy AI Gateway is an open-source extension to Envoy Proxy and Envoy Gateway, providing a Kubernetes-nativ...31.8 GentraceGentrace was an AI evaluation and observability product; the company has shut down and its codebase is now ...31.8 HeliconeHelicone is an open-source AI observability and routing platform centered on requests, sessions, prompts, d...31.8 LiteLLMLiteLLM (BerriAI) is an open-source LLM gateway that exposes 100+ LLM providers — OpenAI, Anthropic, Azure,...31.8 PortkeyPortkey is a production-grade AI gateway and control plane that fronts 1,600+ LLMs with unified routing, fa...31.8 NGINXNGINX is a versatile open-source software for web serving, reverse proxying, caching, load balancing, media...31.7 Syndica Sig Validator RPC APISig is Syndica's open-source Solana validator client implemented in Zig, built for performance, modular RPC...31.7 Janssen ProjectThe Janssen Project is the upstream Linux Foundation open-source identity platform that powers Gluu Flex. I...31.4 EvolutionaryScale ESM Python SDKOfficial Python SDK packaging ESM3 and ESM Cambrian model loaders, the `ESMProtein` multi-track data model,...31.2 Tailcall GraphQL RuntimeHigh-performance GraphQL runtime for composing multiple upstream REST, gRPC, and GraphQL APIs into a unifie...30.8 Pulumi Cloud APIPulumi is a modern infrastructure as code platform that uses general-purpose programming languages (TypeScr...30.6 Terraform Registry APIThe Terraform Registry API provides access to infrastructure-as-code (IaC) modules and providers. HashiCorp...30.6 Apicurio RegistryApicurio Registry is a high-performance, runtime registry for schemas and API designs. It stores and manage...30.5 LlamaIndex Python FrameworkLlamaIndex is an open-source Python framework for building LLM-powered applications including agents, RAG p...30.3 LlamaIndex TypeScript FrameworkLlamaIndex TypeScript is the JavaScript and TypeScript implementation of the LlamaIndex framework for build...30.3 Maastricht University Institute of Data Science (Open Source)The Maastricht University Institute of Data Science (IDS) maintains an active public GitHub organization wi...30.0 Qodo Merge (PR-Agent)AI pull-request reviewer. Available as the Apache-2.0 open-source PR-Agent (CLI, GitHub Action, Docker, sel...29.8 ApimanApiman is an open source API management platform with a developer portal, API gateway, and management UI su...29.5 IKEA DIRIGERA Smart Home Hub API (Unofficial, Local)The DIRIGERA hub is IKEA's next-generation smart home gateway (replacing TRADFRI). It exposes a private, lo...29.3 OSIS - Open Student Information SystemOSIS (Open Student Information System) is an open-source higher-education management platform originated an...29.3 Testcontainers Open-Source LibrariesA family of open-source libraries providing a programmatic API for spinning up and tearing down Docker cont...29.2 MorphirMorphir is a universal language for business and technology that captures business logic in a portable, tec...28.1 Aider Python ModuleAider exposes a Python module entrypoint (`python -m aider`) and an importable package (`aider.main.main`) ...27.9 Stack Auth Self-Hosted (stack-auth/stack)Open-source monorepo containing the Stack Auth backend (Next.js + Postgres) and dashboard. Deployable on cu...27.7 Qrlew Server APIQrlew is Sarus's open-source (Apache 2.0) SQL manipulation and differential-privacy engine, written in Rust...27.5 Renovate CLIThe open source Renovate CLI is a Node.js application distributed via npm and as Docker images on Docker Hu...27.5 Blender Extensions PlatformThe Blender Extensions Platform (extensions.blender.org) provides a curated repository of addons, themes, a...27.2 Blender Python APIThe Blender Python API (bpy) provides Python access to Blender's internal data, operators, and UI component...27.2 Scalar API ClientFully open-source, offline-first API client built on the OpenAPI standard - a Postman/Insomnia alternative ...27.2 Scalar API ReferenceOpen-source (MIT) renderer that turns an OpenAPI/Swagger or AsyncAPI document into an interactive API refer...27.2 Scalar CLIOpen-source command-line tool (@scalar/cli) for validating and linting OpenAPI documents (Spectral rules), ...27.2 Launchpad Web Services APILaunchpad exposes a RESTful Web Services API over its project hosting, bug tracking, code, builds, translat...27.1 Microcks APIOpen-source cloud-native tool for API mocking and contract testing, supporting test-first development by ge...26.6 Port Ocean Integration FrameworkOpen-source framework used to build Port integrations that ingest data from third-party systems into the ca...26.4 SWAPI REST API (swapi.tech)The Node/MongoDB community rebuild of SWAPI, maintained by @semperry at swapi.tech. Wraps the canonical SWA...26.2

Emerging 148 Early or largely undocumented

PyAnsysOpen-source Python ecosystem for Ansys products. The pyansys metapackage bundles 45+ libraries including Py...25.5 Terminal-BenchPublic benchmark / task-submission framework published by Mercor (terminal-bench-3 on GitHub) for evaluatin...25.4 Bruno API ClientBruno is an open-source API client for exploring and testing REST, GraphQL, and gRPC APIs. Collections are ...25.3 Open Hub API (Ohloh)The REST API for Black Duck Open Hub (formerly Ohloh). Returns XML wrapped in a root element that always carr25.2 RocksDB Embedded APIRocksDB C++ library API providing key-value storage operations including Get, Put, Delete, Merge, iterators...24.8 Galaxy Project APIThe open-source Galaxy bioinformatics workbench exposes a REST API for managing histories, datasets, workfl...24.5 Software Engineering Daily Backend APIThe Software Engineering Daily Backend API is an open-source REST API that powers the platform's web, iOS, ...24.4 Software Engineering Daily Mobile AppThe Software Engineering Daily mobile application is an open-source React Native app available on iOS and A...24.4 API BlueprintAPI Blueprint is a high-level API design language created by Apiary for designing and documenting web APIs....23.5 AWS CLIThe AWS CLI v2 is the official command-line interface for Amazon Web Services, providing unified access to ...23.5 Bloomberg HTTP APIHTTP wrapper making the Bloomberg Open API available via HTTP and WebSockets, allowing clients to access re...23.4 DeepEvalDeepEval is an open-source Python framework for evaluating LLM applications as unit tests. It ships with re...23.2 DeepTeamDeepTeam is Confident AI's open-source red teaming framework for stress-testing LLM applications against ad...23.2 Envoy Proxy Admin APIEnvoy is a high-performance, open-source edge and service proxy, and the underlying data plane for Istio, L...22.9 Grafana HTTP APIGrafana is the open-source platform for monitoring and observability, providing a REST HTTP API for managin...22.9 Kubernetes APIThe Kubernetes API is the foundation of the container orchestration ecosystem, providing REST endpoints for...22.9 Prometheus HTTP APIPrometheus is the de-facto open-source monitoring and alerting toolkit for cloud-native applications and a ...22.9 RabbitMQ Management HTTP APIRabbitMQ is a widely-deployed open-source message broker implementing AMQP, MQTT, STOMP, and other messagin...22.9 Redis REST API (Redis Stack)Redis is an in-memory data structure store used as a cache, message broker, and streaming engine. Redis Sta...22.9 Garden Core CLIOpen-source command-line tool and engine that turns a Garden project configuration into a graph of Build, D...22.7 Open Policy Agent (OPA)Open Policy Agent is a CNCF-graduated open source general-purpose policy engine that enables unified, conte...22.6 SPIFFE - Secure Production Identity Framework for EveryoneSPIFFE is a CNCF-graduated open standard for workload identity in dynamic environments. It provides a frame...22.6 SPIRE - SPIFFE Runtime EnvironmentSPIRE is the reference implementation of SPIFFE, a CNCF-graduated production-ready toolchain for establishi...22.6 Frankfurter APIFree and open-source API for current and historical forex rates.22.5 WgetGNU Wget is a free command-line utility for non-interactive downloading of files from the web using HTTP, H...22.3 Wget2GNU Wget2 is the next-generation successor to GNU Wget, built from scratch around libwget. It is multi-thre...22.3 TripoSR (Open Source)Open-source single-image 3D reconstruction model released by VAST AI Research in collaboration with Stabili...22.2 RepolinterRepolinter is an open source linting tool for repositories that validates compliance with open source best ...22.1 RequestsRequests is a simple and elegant HTTP library for Python, designed for human beings. It provides a clean, h...21.7 Gloo EdgeGloo Edge is a feature-rich, Kubernetes-native ingress controller and API gateway built on Envoy Proxy, sup...21.6 Web Summit Developer ProgrammeThe Web Summit Developer Programme provides free ticket access for active developers and open source contri...21.6 Goose AI AgentGoose is a general-purpose, open-source AI agent that runs locally on your machine. Originally from Block a...21.5 Bru Markup Language (.bru)Bru is Bruno's plain-text domain-specific markup language. Each request is stored as a .bru file capturing ...21.2 BlackbirdBlackbird is Xanadu's quantum assembly language and intermediate representation for continuous-variable pho...21.0 CatalystCatalyst is a JIT compiler for hybrid quantum-classical programs written in PennyLane. 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Supports R...20.0 Storybook MCP ServerThe Storybook MCP (Model Context Protocol) server enables AI agents to interact with a running Storybook in...20.0 Public APIs DirectoryA collective list of free APIs organized by category including Animals, Finance, Weather, Geocoding, Govern...19.9 baytrends Water Quality Trend APIbaytrends is an open-source R package developed by Tetra Tech for evaluating long-term trends in Chesapeake...19.6 Tetra Tech Data Discovery Tool APIThe Data Discovery Tool (DDT) is an open-source environmental data analysis platform developed by Tetra Tec...19.6 Maximum Independent Set SolverMaximum Independent Set (MIS) solver library that exploits the natural mapping of MIS onto Rydberg-blockade...19.5 Pulser SDKPulser is Pasqal's open-source (Apache-2.0) Python framework for composing, simulating, and executing pulse...19.5 Qadence SDKQadence is Pasqal's higher-level digital-analog quantum programming interface for writing variational quant...19.5 QoolQit SDKQoolQit is Pasqal's Python package for simplified algorithm development in the Rydberg Analog Model on neut...19.5 Quantum Evolution Kernel (QEK)QEK is Pasqal's open-source graph machine learning library that uses quantum-driven similarity metrics deri...19.5 QUBO SolverQuadratic Unconstrained Binary Optimization solver library that combines classical heuristics with quantum ...19.5 Superduper FrameworkOpen-source Python framework (superduper-framework) for declaring AI models, embeddings, vector indexes, RA...19.5 Home Assistant REST APIThe Home Assistant REST API provides access to all home automation entities including climate/HVAC entities...18.8 Apache Software FoundationThe Apache Software Foundation hosts 300+ open source projects spanning big data, cloud, messaging, databas...18.3 Swagger CodegenSwagger Codegen generates server stubs, client SDKs, and API documentation from OpenAPI specifications in o...18.2 Swagger EditorSwagger Editor is a browser-based editor for writing and validating OpenAPI and AsyncAPI specifications wit...18.2 Swagger UISwagger UI renders OpenAPI specifications as interactive API documentation, allowing developers to explore ...18.2 GoReplayGoReplay captures and replays live HTTP traffic, enabling developers to test APIs and applications with rea...18.1 OpenTofu CLIOpenTofu is a CLI-driven infrastructure-as-code tool forked from Terraform. The opentofu binary reads Hashi...18.1 Overture Maps Python CLIOpen-source Python command-line tool and library for downloading and querying Overture data. Maintained at ...18.1 Overture SchemaCanonical open schema specification for all Overture themes, maintained in the OvertureMaps/schema GitHub r...18.1 Overture TilesOpen tile-generation tooling that builds vector tilesets from Overture data for rendering and downstream ap...18.1 RetrofitRetrofit is a type-safe HTTP client for the JVM that turns annotated Java/Kotlin interfaces into HTTP API c...18.0 API DashAPI Dash is an open source AI-powered cross-platform API client built with Flutter for desktop and mobile. ...17.9 Open Technology FundThe Open Technology Fund (OTF) is a U.S. government-funded independent nonprofit that supports the developm...17.9 Score SpecificationThe Score Specification (score.yaml) is a declarative, platform-agnostic workload definition format that ca...17.9 Thymeleaf CoreThe core Thymeleaf template engine library providing HTML, XML, TEXT, JavaScript, and CSS template mode pro...17.8 Brocade Library Services (Anet)Brocade is the integrated, web-based library management system developed by Anet, the software department o...17.7 OAI-PMH Repository Plugin (Omeka)Public PHP source hosted on the official EcoleDesPontsParisTech GitHub organization. A forked OAI-PMH repos...17.3 Lura FrameworkThe Lura Framework is an open-source Go library for building ultra-high-performance API gateways with middl...17.2 RestSharpRestSharp is a simple REST and HTTP API client library for .NET, wrapping HttpClient with a fluent API for ...17.2 Step CIStep CI is an open source API Quality Assurance framework that is language-agnostic and configured using YA...17.2 CentrifugoAn open-source language-agnostic realtime messaging server providing WebSocket, SSE, HTTP streaming, and We...17.0 LiveKitAn open-source WebRTC platform marketed as "The platform for voice, video, and physical AI agents." 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The homepage states ...15.8 Inspect AIInspect AI is an open-source framework for large language model evaluations developed and maintained by the...15.8 MLflow LLM EvaluateMLflow LLM evaluate extends MLflow's experiment tracking with mlflow.evaluate() support for LLM tasks. The ...15.8 OpenAI EvalsOpenAI Evals is the open-source framework released by OpenAI for evaluating large language models and LLM-b...15.8 PromptfooPromptfoo is an open-source CLI and library for evaluating and red-teaming LLM applications. The docs descr...15.8 RagasRagas is an open-source evaluation library focused on retrieval-augmented generation, described in its own ...15.8 TruLensTruLens is an open-source evaluation and tracing platform for AI agents that helps developers "move from vi...15.8 DapperDoxDapperDox is an open-source API documentation generator that renders beautiful, customizable reference docs...15.3 Kata ContainersKata Containers is an open source container runtime that uses lightweight virtual machines to provide the s...15.3 LangKitLangKit is an open-source toolkit that extracts telemetry from LLM prompts and responses including relevanc...15.3 Sony gobreaker Circuit Breakergobreaker is a Go implementation of the Circuit Breaker pattern, widely used in microservice resilience des...15.3 Sony Neural Network Libraries (NNabla)NNabla is Sony's open-source deep-learning framework with Python and C++ bindings, dynamic and static compu...15.3 Sonyflake Distributed ID GeneratorSonyflake is a Go library producing 63-bit unique IDs inspired by Twitter's Snowflake but tuned for longer ...15.3 whylogswhylogs is an open-source data logging library that creates approximate statistical profiles of datasets, e...15.3 Open edX REST APIOpen-source REST API surface across the Open edX platform: Enrollment API, Courses API, User API, Catalog A...15.2 Apache KafkaOpen-source distributed event streaming platform governed by the Apache Software Foundation. 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Single binary,...14.8 Spark Structured StreamingStream-processing API built on Spark SQL using a micro-batch (and experimental continuous) execution model....14.8 gVisorgVisor is an open-source application kernel written in Go that provides an additional layer of isolation be...14.2 Cline VS Code ExtensionOpen-source autonomous coding agent for VS Code. Reads/writes files, runs commands, browses the web, calls ...14.1 Confidential Computing Consortium ProjectsA portfolio of open source projects governed by the Confidential Computing Consortium covering Trusted Exec...14.1 Changelog Open Source Platform (GitHub)The Changelog platform is an open source Elixir and Phoenix application that powers changelog.com. The sour...13.5 The Changelog Podcast RSS FeedThe Changelog podcast RSS feed provides access to all episodes of The Changelog, a weekly podcast covering ...13.5 CNCF Hosted Projects (Standards Steward)CNCF stewards an open-source project portfolio whose APIs underpin much of modern cloud infrastructure - Ku...13.4 ETWAnalyzer Command Line ToolC# command-line tool published by Siemens Healthineers for analyzing Event Tracing for Windows (ETW) captur...13.4 K2s Kubernetes Distribution for Windows HostsOpen-source Kubernetes distribution built specifically for Windows hosts, published from the Siemens-Health...13.4 Patch-CLIP Embedding ModelPython research project from the Siemens-Healthineers GitHub org that extends the CLIP architecture with pa...13.4 SHIELD-DAVE Medical Device Cybersecurity PlatformPHP-based platform from the Siemens-Healthineers GitHub org focused on medical device cybersecurity and US ...13.4 Adept Fuyu-8B ModelOpen-source 9B-parameter image-text-to-text multimodal model designed for digital agents - simple architect...13.1 Adept Persimmon-8B Base ModelOpen-source 8B-parameter base text generation model with permissive license. Self-hosted only - no managed ...13.1 Adept Persimmon-8B Chat ModelOpen-source chat-tuned variant of Persimmon-8B. Self-hosted only - no managed API.13.1 RTSP ImplementationsCommon open-source RTSP server and client implementations used in production. MediaMTX (formerly rtsp-simpl...13.0 ApivaultApivault is a free, open-source API directory that serves as a gateway to a world of public APIs. It catalo...12.8 Linux Foundation ProjectsProgrammatic access to Linux Foundation project resources, member data, and open source ecosystem informati...12.7 CONTRIBUTING.md Related ConventionsCONTRIBUTING.md is one of several community health files GitHub looks for when scoring a repository communi...12.3 LF Edge APIProgrammatic access to LF Edge project resources, APIs, and edge computing framework tools.12.3 LF Research APIProgrammatic access to LF Research publications, open source trend data, and industry analysis resources.12.3

Minimal 10 Almost no public developer surface

Software Discovery ToolSoftware Discovery Tool helps match developer requirements with available open source software tested on th...10.9 zopen Communityzopen is a community-driven catalog and build framework that ports and packages popular open source tools f...10.9 Maya Hydra APIMaya plugin API that replaces the main Maya viewport with a Hydra viewer, enabling custom render delegate i...10.5 pvfactorspvfactors is an open-source Python library for modeling diffuse shading and bifacial photovoltaic (PV) irra...9.8 PVMismatchPVMismatch is an open-source Python library for calculating mismatch losses in photovoltaic systems. It mod...9.8 SolarUtilsSolarUtils is an open-source Python package providing solar position algorithms and utility functions for s...9.8 TruLens (Open Source)Open-source Python library for evaluating and tracking LLM applications. Provides feedback functions (groun...9.7 O-RAN Software Community APIProgrammatic access to O-RAN Software Community open interface specifications, RAN intelligence APIs, near-...9.5 LF Networking APIProgrammatic access to LF Networking project resources, APIs, and open networking infrastructure tools.9.1 Lura ProjectLura Project is an open source framework for building ultra-performant API gateways with middlewares.8.6

Score breakdown

Frequency

74.8

log-scaled weighted occurrences

Breadth

7.8

spread across providers

Quality lift

60.8

mean composite of providers using it

Cohesion

49.0

strength of nearest seed neighbor

Where this tag comes from

Provider tag1062

Api tag333

Cohort brief

Auto-generated

The 1159 providers in the APIs.io catalog tagged Open-Source, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

1159

of 1161 on the roster

Mean Kin Score

29.4

+8.7 vs catalog 20.7

Mean Agent Readiness

14.9

+5.2 vs catalog 9.7

Spread

1.6–91.3

median 29.2 · σ 14.4

How the 1159 split by band

Exemplar 20Strong 37Developing 205Thin 411Emerging 370Minimal 116

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Contract Quality	31	17.5	+13.5	1159
Operational Transparency	23.7	11.3	+12.4	1159
Developer Ergonomics	28.3	17.9	+10.4	1159
Discoverability	65.8	60.4	+5.4	1159
Contract Governance	10.5	6.4	+4.1	1159
Access Clarity	25.4	22.3	+3.1	1159

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes

Artifact	This cohort	Catalog	Difference
MCP server (any)	13%	16%	-3
MCP server (first-party)	6%	7%	-1
Agent Skills	0%	0%	0
OAuth scopes	7%	9%	-2
Security	95%	88%	+7
Arazzo workflows	3%	2%	+1
Governance rules	36%	13%	+23

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score

1 Medplum 91.3
2 RudderStack 80.2
3 Svix 79.2
4 Swetrix 78.6
5 Adobe Campaign 77.3
6 Canvas LMS 76.2
7 NextGen Healthcare 75.7
8 Ghost 74.4
9 Plunk 70.6
10 Heroic Labs 70.4

Work with this as data

Every tag here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for tags

7 MCP tools reach this

find_tagsBrowse and filter every tag in the catalog.
get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools

Call it yourself

curl for this page

This tag

curl "https://apis.io/api/v1/tags/open-source"

All tags

curl "https://apis.io/api/v1/tags?limit=25"

As a scored cohort

curl "https://apis.io/api/v1/cohorts/tag/open-source"

The distribution (Pro)

curl "https://apis.io/api/v1/cohorts/tag/open-source/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

Discovery needs no key. Ratings and market analysis are Pro.

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