Open Mainframe Project

The Open Mainframe Project is a Linux Foundation project encouraging the use of Linux-based operating systems and open source software on mainframe computers. Founded in 2015 with IBM, it hosts projects such as Zowe (modern interfaces for z/OS), Feilong (z/VM cloud connector), Galasa (testing), and a range of community programs that promote mainframe skills and open source on IBM Z and LinuxONE platforms.

Open Mainframe Project publishes 12 APIs on the APIs.io network. Tagged areas include Cloud-Native, Education, Enterprise, IBM Z, and Linux Foundation.

Open Mainframe Project’s developer surface includes documentation, engineering blog, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub

13.6/100 emerging ▬ flat Agent 3/100 human only self hosted · Apache-2.0 Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemium

12 APIs

Cloud-Native Education EnterpriseIBM ZLinux FoundationLinux on ZMainframe Open-Sourcez/OSz/VM

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 13.6/100 · emerging

Contract Quality 0.0 / 19

Developer Ergonomics 1.8 / 15

Access Clarity 2.4 / 15

Operational Transparency 1.0 / 10

Contract Governance 0.0 / 9

Discoverability 4.9 / 8

Regulatory Posture 1.7 / 15

Open Source Surface 4.0 / 10

Agent readiness — 3/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Education & Research regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 75 points between them, because both conditional facets apply and carry 25 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/open-mainframe-project: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 12

Individual APIs this provider publishes, each with its own machine-readable definition.

Zowe

Zowe is an open source software framework that delivers modern interfaces to interact with z/OS, including a CLI, a web UI (Application Framework), and REST APIs (API Mediation ...

Feilong

Feilong is an open source z/VM cloud connector that exposes z/VM functions as REST APIs to accelerate z/VM adoption and enable integration with modern cloud automation tooling.

Galasa

Galasa is an open source deep integration test framework able to run tests across z/OS, distributed systems, and cloud platforms, with REST APIs for managing test runs and resou...

Tessia

Tessia automates the installation, configuration, and testing of Linux systems running on the IBM Z platform, exposing a REST API for managing systems, networks, and provisionin...

GenevaERS

GenevaERS is a single-pass optimization engine for high-volume data extraction, transformation, and reporting on z/OS, used to consolidate large-scale mainframe analytics worklo...

COBOL Check

COBOL Check is a unit testing framework for COBOL that enables test-driven development for mainframe code with assertion-based tests runnable from CI pipelines.

zopen Community

zopen is a community-driven catalog and build framework that ports and packages popular open source tools for z/OS, expanding the open source tool surface available to mainframe...

Ambitus

Ambitus fosters a community focused on educating developers about open source technologies running on z/OS and Linux on Z, including curated tutorials and learning paths.

CBT Tape

CBT Tape is a long-running open library of free software distributions for IBM mainframe MVS, OS/390, and z/OS environments.

COBOL Programming Course

An open educational initiative offering structured COBOL learning materials alongside contemporary tooling such as VS Code, Zowe CLI, and Git for modern mainframe development wo...

Software Discovery Tool

Software Discovery Tool helps match developer requirements with available open source software tested on the IBM Z platform.

Mainframe Open Education

Mainframe Open Education is a community for newcomers and experienced mainframe practitioners, sharing learning resources, mentoring guidance, and skills programs.

Scroll for all 12

Pricing Plans 1

Published pricing tiers and plan structures.

Open Mainframe Project Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Open Mainframe Project Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Open Mainframe Project Finops

FINOPS

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Open Mainframe Project Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Documentation 2

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

Build 2

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

IssueTracker

IssueTracker

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 4

Properties that don't map to a standard resource type

All Projects

Events

Membership

Linux Foundation

Source (apis.yml)

aid: open-mainframe-project
name: Open Mainframe Project
description: The Open Mainframe Project is a Linux Foundation project encouraging the use of Linux-based operating systems
  and open source software on mainframe computers. Founded in 2015 with IBM, it hosts projects such as Zowe (modern interfaces
  for z/OS), Feilong (z/VM cloud connector), Galasa (testing), and a range of community programs that promote mainframe skills
  and open source on IBM Z and LinuxONE platforms.
type: Index
deliveryModel:
  model: self-hosted
  license: Apache-2.0
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
position: Consuming
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/open-mainframe-project.png
tags:
- Cloud-Native
- Education
- Enterprise
- IBM Z
- Linux Foundation
- Linux on Z
- Mainframe
- Open-Source
- z/OS
- z/VM
tags_raw:
- Cloud Native
- Education
- Enterprise
- IBM Z
- Linux Foundation
- Linux on Z
- Mainframe
- Open Source
- z/OS
- z/VM
created: '2026-03-16'
modified: '2026-04-28'
url: https://raw.githubusercontent.com/api-evangelist/open-mainframe-project/refs/heads/main/apis.yml
specificationVersion: '0.23'
apis:
- aid: open-mainframe-project:zowe
  name: Zowe
  description: Zowe is an open source software framework that delivers modern interfaces to interact with z/OS, including
    a CLI, a web UI (Application Framework), and REST APIs (API Mediation Layer) for jobs, datasets, USS files, and system
    management.
  humanURL: https://www.zowe.org/
  tags:
  - API Mediation
  - CLI
  - Mainframe
  - REST APIs
  - z/OS
  properties:
  - type: Documentation
    url: https://docs.zowe.org/
  - type: GitHubOrganization
    url: https://github.com/zowe
- aid: open-mainframe-project:feilong
  name: Feilong
  description: Feilong is an open source z/VM cloud connector that exposes z/VM functions as REST APIs to accelerate z/VM
    adoption and enable integration with modern cloud automation tooling.
  humanURL: https://www.openmainframeproject.org/projects/feilong
  tags:
  - Cloud Connector
  - REST APIs
  - z/VM
  properties:
  - type: Documentation
    url: https://cloudlib4zvm.readthedocs.io/
  - type: GitHubRepository
    url: https://github.com/openmainframeproject/feilong
- aid: open-mainframe-project:galasa
  name: Galasa
  description: Galasa is an open source deep integration test framework able to run tests across z/OS, distributed systems,
    and cloud platforms, with REST APIs for managing test runs and resources.
  humanURL: https://galasa.dev/
  tags:
  - Integration Testing
  - Mainframe
  - Test Automation
  properties:
  - type: Documentation
    url: https://galasa.dev/docs/
  - type: GitHubOrganization
    url: https://github.com/galasa-dev
- aid: open-mainframe-project:tessia
  name: Tessia
  description: Tessia automates the installation, configuration, and testing of Linux systems running on the IBM Z platform,
    exposing a REST API for managing systems, networks, and provisioning workflows.
  humanURL: https://gitlab.com/tessia-project
  tags:
  - Automation
  - Linux on Z
  - Provisioning
  properties:
  - type: Documentation
    url: https://gitlab.com/tessia-project/tessia/-/blob/master/README.md
  - type: GitLab Repository
    url: https://gitlab.com/tessia-project/tessia
- aid: open-mainframe-project:genevaers
  name: GenevaERS
  description: GenevaERS is a single-pass optimization engine for high-volume data extraction, transformation, and reporting
    on z/OS, used to consolidate large-scale mainframe analytics workloads.
  humanURL: https://www.openmainframeproject.org/projects/genevaers
  tags:
  - Analytics
  - Data Extraction
  - z/OS
  properties:
  - type: Documentation
    url: https://genevaers.org/
  - type: GitHubOrganization
    url: https://github.com/genevaers
- aid: open-mainframe-project:cobol-check
  name: COBOL Check
  description: COBOL Check is a unit testing framework for COBOL that enables test-driven development for mainframe code with
    assertion-based tests runnable from CI pipelines.
  humanURL: https://www.openmainframeproject.org/projects/cobol-check
  tags:
  - COBOL
  - Testing
  - TDD
  properties:
  - type: GitHubRepository
    url: https://github.com/openmainframeproject/cobol-check
- aid: open-mainframe-project:zopen-community
  name: zopen Community
  description: zopen is a community-driven catalog and build framework that ports and packages popular open source tools for
    z/OS, expanding the open source tool surface available to mainframe developers.
  humanURL: https://zopen.community/
  tags:
  - Open-Source
  - Package Management
  - z/OS
  tags_raw:
  - Open Source
  - Package Management
  - z/OS
  properties:
  - type: Documentation
    url: https://zopen.community/
  - type: GitHubOrganization
    url: https://github.com/zopencommunity
- aid: open-mainframe-project:ambitus
  name: Ambitus
  description: Ambitus fosters a community focused on educating developers about open source technologies running on z/OS
    and Linux on Z, including curated tutorials and learning paths.
  humanURL: https://www.openmainframeproject.org/projects/ambitus
  tags:
  - Community
  - Education
  - Linux on Z
  - z/OS
  properties:
  - type: GitHubOrganization
    url: https://github.com/ambitus
- aid: open-mainframe-project:cbt-tape
  name: CBT Tape
  description: CBT Tape is a long-running open library of free software distributions for IBM mainframe MVS, OS/390, and z/OS
    environments.
  humanURL: https://www.cbttape.org/
  tags:
  - Mainframe
  - MVS
  - Software Library
  - z/OS
  properties:
  - type: Documentation
    url: https://www.cbttape.org/
- aid: open-mainframe-project:cobol-programming-course
  name: COBOL Programming Course
  description: An open educational initiative offering structured COBOL learning materials alongside contemporary tooling
    such as VS Code, Zowe CLI, and Git for modern mainframe development workflows.
  humanURL: https://github.com/openmainframeproject/cobol-programming-course
  tags:
  - COBOL
  - Education
  - Training
  properties:
  - type: GitHubRepository
    url: https://github.com/openmainframeproject/cobol-programming-course
- aid: open-mainframe-project:software-discovery-tool
  name: Software Discovery Tool
  description: Software Discovery Tool helps match developer requirements with available open source software tested on the
    IBM Z platform.
  humanURL: https://www.openmainframeproject.org/projects/software-discovery-tool
  tags:
  - Discovery
  - IBM Z
  - Open-Source
  tags_raw:
  - Discovery
  - IBM Z
  - Open Source
  properties:
  - type: GitHubRepository
    url: https://github.com/openmainframeproject/software-discovery-tool
- aid: open-mainframe-project:mainframe-open-education
  name: Mainframe Open Education
  description: Mainframe Open Education is a community for newcomers and experienced mainframe practitioners, sharing learning
    resources, mentoring guidance, and skills programs.
  humanURL: https://www.openmainframeproject.org/projects/mainframe-open-education
  tags:
  - Community
  - Education
  - Mentorship
  properties:
  - type: Documentation
    url: https://www.openmainframeproject.org/projects/mainframe-open-education
common:
- type: IssueTracker
  url: https://github.com/openmainframeproject/feilong/issues
- type: CodeOfConduct
  url: https://github.com/openmainframeproject/feilong/blob/master/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/openmainframeproject/feilong/blob/master/CONTRIBUTING.md
- type: License
  name: Apache-2.0
  url: https://github.com/openmainframeproject/feilong/blob/master/LICENSE
- type: DomainSecurity
  url: security/open-mainframe-project-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/the-open-mainframe-project
- type: Website
  url: https://www.openmainframeproject.org/
- type: All Projects
  url: https://www.openmainframeproject.org/all-projects
- type: Documentation
  url: https://www.openmainframeproject.org/projects
- type: GitHubOrganization
  url: https://github.com/openmainframeproject
- type: Blog
  url: https://www.openmainframeproject.org/blog
- type: Events
  url: https://www.openmainframeproject.org/events
- type: Membership
  url: https://www.openmainframeproject.org/about/members
- type: Linux Foundation
  url: https://www.linuxfoundation.org/projects/open-mainframe/
maintainers:
- FN: Kin Lane
  email: info@apievangelist.com

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