authentik — #2 Alternative to Auth0

Name: authentik
Rating: 4.9 (1393 reviews)

Flexible MIT-licensed identity provider with visual flow-based auth policies

Modern Python + Go identity server uniting OAuth2/OIDC, SAML, LDAP, RADIUS, and reverse-proxy forward auth behind customizable multi-stage login flows.

License: MIT · Pricing: Open Core · Compare all Auth0 alternatives · Official Website