Keycloak

Keycloak is an open source identity and access management solution

Features: • User registration • Social login • Single sign-on/sign-off across all applications belonging to the same realm • Two-factor authentication • LDAP integration • Kerberos broker • Multitenancy with per-realm customizable skin • Custom extensions to extend the core functionality • Multilingual. Optionally, you can add any language to your liking. Details at https://www.keycloak.org/docs/21.1.1/server_development/#adding-a-language-to-a-realm

Components: • Keycloak server, including the API and graphical interface. • Keycloak application adapter: a set of libraries to call the server.

As of March 2018 this WildFly community project is under the stewardship of Red Hat who use it as the upstream project for their RH-SSO product.