Open source. Open possibilities.

Better Auth is a framework-agnostic authentication and authorization framework for TypeScript, offering built-in features and a plugin ecosystem for advanced needs like 2FA and multi-tenant support.

Tailscale is an open-source mesh VPN built on WireGuard, providing a daemon and CLI to create secure private networks across Linux, Windows, macOS, FreeBSD and OpenBSD.

A transport-agnostic OAuth 2.1 and OpenID Connect server built on OpenIddict and redb.Route, supporting multiple databases, MFA, WebAuthn, SCIM, and in-process direct-vm calls.

Hanko is an open-source, framework-agnostic authentication and user management solution positioned as an alternative to Auth0, Clerk, WorkOS and Stytch. It supports passwords, passkeys, MFA, social logins and SAML SSO, and can be self-hosted or used via Hanko Cloud.

Sa-Token is an open-source Java authentication framework offering login, permission validation, distributed sessions, gateway auth, SSO, OAuth2.0, JWT, API Key signing, with out-of-the-box support for SpringBoot and Solon.

Authelia is an open-source authentication and authorization server that provides two-factor authentication and single sign-on through a web portal. Working alongside reverse proxies, it allows, denies or redirects requests, and supports OpenID Connect 1.0 / OAuth 2.0, WebAuthn security keys and passkeys, TOTP, and Duo push notifications.