Authelia is an open-source highly-available authentication server providing single sign-on capability and two-factor authentication to applications running behind NGINX. Authelia works in cooperation with proxies at the edge of your network to protect your internal resources.

Add authentication to applications and secure services with minimum effort. No need to deal with storing users or authenticating users. Keycloak provides user federation, strong authentication, user management, fine-grained authorization, and more.

authentik is an IdP (Identity Provider) and SSO (single sign on) that is built with security at the forefront of every piece of code, every feature, with an emphasis on flexibility and versatility.

API-first Identity Management, Authentication and Authorization. For Secure, Global, GDPR-compliant Apps

An open source enterprise digital identity platform for CIAM or workforce... Janssen is a distribution of standards-based, developer friendly, components that are engineered to work together in any cloud. #OAuth #OpenID #FIDO

An open-source UI-first Identity and Access Management (IAM) / Single-Sign-On (SSO) platform with web UI supporting OAuth 2.0, OIDC, SAML, CAS, LDAP, SCIM, WebAuthn, TOTP, MFA, RADIUS, Google Workspace, Active Directory and Kerberos | Casdoor · An open-source UI-first Identity and Access Management (IAM) / Single-Sign-On (SSO) platform with web UI supporting OAuth 2.0, OIDC, SAML, CAS, LDAP, SCIM, WebAuthn, TOTP, MFA, RADIUS, Google Workspace, Active Directory and Kerberos

OpenAM is an open access management solution that includes Authentication, SSO, Authorization, Federation, Entitlements and Web Services Security. - OpenIdentityPlatform/OpenAM

CAS is an open and well-documented authentication protocol. The primary implementation of the protocol is an open-source Java server component by the same name hosted here, with support for a plethora of additional authentication protocols and features such a SAML2, OpenID Connect, MFA and many many more.