Keycloak

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Keycloak is a free, open-source tool that provides identity and access management with single sign-on (SSO) for modern applications and services. It supports OpenID Connect, OAuth 2.0, and SAML, and includes features like user management, two-factor authentication, and managing permissions and roles, along with token services. It can be integrated with front-end frameworks such as React or Angular and can run with Docker for deployment.

Key facts:
- Written in Java and released under the Apache 2.0 license
- First production release in September 2014
- Donated to the Cloud Native Computing Foundation (CNCF) as an incubating project in April 2023
- Red Hat based its RH SSO on Keycloak; the JBoss naming was phased out in favor of WildFly
- Latest stable release: 26.5.2 (January 23, 2026)
- Source code: github.com/keycloak/keycloak
- Website: keycloak.org