Top 5 idp open source projects

OpenID Connect (OIDC) identity and OAuth 2.0 provider with pluggable connectors

U2F multifactor authentication plugin for Shibboleth IdPv3

Securily generates temporary AWS credentials through identity providers using SAML

Reference implementation of SSO via the SAML Identity to Service Provider initiated HTTP POST Binding

A highly configurable yet simple to use TOTP based two-factor authentication processing module for SimpleSAMLphp.