Red Hat SSO has a lot of very concise, well laid out documentation, which is available in the free edition as well.
Red Hat Single Sign On provides strong support for single sign-on protocols, seamlessly integrating with existing systems using OIDC protocols and ITL integration. It allows for single password use, enhancing simplicity and security, and offers flexibility with robust functionalities out of the box. This dual-aspect product combines open-source community benefits with a commercial offering, but security, architecture, and technical support could be improved. Red Hat communicates its actions and plans, offering various resources.