Open source webapi projects
Every project in the registry tagged webapi, ranked by real GitHub adoption.
The OpenAPI Specification Repository
The Swagger/OpenAPI toolchain for .NET, ASP.NET Core and TypeScript.
An extensible framework to audit executing operations in .NET
Frequently asked questions
How many open source webapi projects are there?
This registry tracks 3 projects tagged webapi, with 41,231 GitHub stars between them. The most-adopted is OpenAPI-Specification at 31,215 stars.
Are these webapi projects free to use?
Yes — 3 of the 3 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 webapi 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 webapi 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.