Open source oauth2-server projects
Every project in the registry tagged oauth2-server, ranked by real GitHub adoption.
Take control of your identity with a secure, flexible solution
Internet-scale OpenID Certified™ OpenID Connect and OAuth2.1 provider that integrates with your user management through headless APIs. Solve OIDC/OAuth2 user ca
Zero-Trust VPN with built-in 2FA/MFA and SSO capabilities
OpenID/Connect, OAuth2, WS-Federation and SAML 2.0 server based on Duende IdentityServer and ITFoxtec Identity SAML 2.0 with its admin UI
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Frequently asked questions
How many open source oauth2-server projects are there?
This registry tracks 4 projects tagged oauth2-server, with 47,505 GitHub stars between them. The most-adopted is Authentik at 26,209 stars.
Are these oauth2-server projects free to use?
Yes — 2 of the 4 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 oauth2-server 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 oauth2-server projects still maintained?
3 of the 4 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.