Keycloak
96 · HealthyIdentity and access management server with SSO, OIDC, SAML and user federation (CNCF).
Login, single sign-on, user management and identity providers. Ranked by health score.
Identity and access management server with SSO, OIDC, SAML and user federation (CNCF).
Identity provider with flows, SSO across OIDC, SAML, LDAP and a proxy outpost.
Auth and identity service for SaaS and AI apps, built on OIDC with organizations and RBAC.
Multi-tenant identity platform with event-sourced audit trail and B2B organizations.
Authentication server with passkeys, passwords, social login and drop-in web components.
TypeScript authentication framework with email and social login, passkeys, two-factor, organizations and SSO plugins.
Headless identity and user-management server with an API-first design.
Lightweight OpenID Connect provider that signs users in to your apps with passkeys only.
Authentication backend with prebuilt UI, sessions and multi-tenancy.
Single sign-on and two-factor portal that sits in front of web apps via a reverse proxy.






Health and license are separate verdicts: a project can be well maintained and still not be open source.
| Project | Health | License | Stars |
|---|---|---|---|
| Keycloak | 96 · Healthy | Free to useApache-2.0 | 37k |
| authentik | 91 · Healthy | Free core, paid extrasMIT | 26k |
| Logto | 86 · Healthy | Free core, paid extrasMPL-2.0 | 15k |
| ZITADEL | 84 · Healthy | Free, share hosted changesAGPL-3.0Relicensed 2025 | 15k |
| Hanko | 84 · Healthy | Free, share hosted changesAGPL-3.0 | 9.0k |
| Better Auth | 83 · Healthy | Free to useMIT | 30k |
| Ory Kratos | 78 · Stable | Free to useApache-2.0 | 14k |
| Pocket ID | 78 · Stable | Free to useBSD-2-Clause | 9.5k |
| SuperTokens | 74 · Stable | Free core, paid extrasApache-2.0 | 15k |
| Authelia | 71 · Stable | Free to useApache-2.0 | 29k |
Alternatives to Amazon CognitoAlternatives to Auth0Alternatives to ClerkAlternatives to OktaAlternatives to StytchAlternatives to WorkOS
Scores last refreshed from GitHub on 9 October 2026. How we score.