Open source openapi3 projects
Every project in the registry tagged openapi3, ranked by real GitHub adoption.
FastAPI framework, high performance, easy to learn, fast to code, ready for production
Lightweight, fast, and open-source API client for developers
OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec
📘 OpenAPI/Swagger-generated API Reference Documentation
Open-source API documentation and testing platform
Generate TypeScript types from OpenAPI 3 specs
Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API
Related tags
Frequently asked questions
How many open source openapi3 projects are there?
This registry tracks 7 projects tagged openapi3, with 234,117 GitHub stars between them. The most-adopted is fastapi at 102,402 stars.
Are these openapi3 projects free to use?
Yes — 7 of the 7 carry an explicit open-source licence across 2 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which openapi3 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 openapi3 projects still maintained?
7 of the 7 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.