Keycloak is an open source software product to allow single sign-on with Identity and Access Management aimed at modern applications and services. 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.
documentation
Single Sign-On (SSO)
Single sign-on (SSO) is an authentication scheme that allows a user to log in with a single ID and password to any of several related, yet independent, software systems.
