Open source oas projects
Every project in the registry tagged oas, ranked by real GitHub adoption.
The OpenAPI Specification Repository
A flexible JSON/YAML linter for creating automated style guides, with baked in support for OpenAPI (v3.1, v3.0, and v2.0), Arazzo v1.0, as well as AsyncAPI v2.x
Port OpenAPI Specs to Postman Collections, inject test suite and run via Newman 👨🏽🚀
Related tags
Frequently asked questions
How many open source oas projects are there?
This registry tracks 3 projects tagged oas, with 35,110 GitHub stars between them. The most-adopted is OpenAPI-Specification at 31,217 stars.
Are these oas projects free to use?
Yes — 3 of the 3 carry an explicit open-source licence across 1 distinct licence, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which oas project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these oas projects still maintained?
3 of the 3 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.