Open source apis projects
Every project in the registry tagged apis, ranked by real GitHub adoption.
Visual workflow automation with code flexibility and AI agents
🦍 The API and AI Gateway
The OpenAPI Specification Repository
A tool for mocking HTTP services
The first AI agent that builds permissionless integrations through reverse engineering platforms' internal APIs.
Blazing-fast API gateway with linear scalability
A compiler for APIs described by the OpenAPI Specification with plugins for code generation and other API support tasks.
AI-powered automation that lives in your Slack workspace
Welcome to the WSO2 API Manager source code! For info on working with the WSO2 API Manager repository and contributing code, click the link below.
SDKs for CoinAPI & FinFeedAPI
Related tags
Frequently asked questions
How many open source apis projects are there?
This registry tracks 10 projects tagged apis, with 304,901 GitHub stars between them. The most-adopted is n8n at 209,375 stars.
Are these apis projects free to use?
Yes — 9 of the 10 carry an explicit open-source licence across 3 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 apis 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 apis projects still maintained?
8 of the 10 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.