authelia
The Single Sign-On Multi-Factor portal for web apps, now OpenID Certified™
zitadel
ZITADEL - Identity infrastructure, simplified for you.
casdoor
An open-source AI-first Identity and Access Management (IAM) /AI MCP & agent gateway and auth server with web UI supporting MCP, A2A, OAuth 2.1, OIDC, SAML, CAS, LDAP, SCIM, WebAuthn, TOTP, MFA, Face ID, Google Workspace, Azure AD
logto-io
🧑🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC.
apereo
Apereo CAS - Identity & Single Sign On for all earthlings and beyond.
teamhanko
Modern authentication, on your terms. Open source alternative to Auth0, Clerk, WorkOS, Stytch.