Casdoor is a promising open-source IAM solution: <a href="https://casdoor.org/" rel="nofollow noreferrer">https://casdoor.org/</a> , written in Go and React. All features like OIDC, OAuth 2.0, SAML, CAS, LDAP, WebAuthn and 2FA are all supported. SaaS management is also supported like pricing, subscription etc.<p>Source code: <a href="https://github.com/casdoor/casdoor">https://github.com/casdoor/casdoor</a><p>Compared to Keycloak, Casdoor has:<p>1. Support high-concurrency and use less memory (Go v.s. Java)<p>2. More modern SPA-style web UI (with React and Ant Design), more CDN friendly<p>3. full-fledged RESTful API<p>4. Support a lot of provider types: OAuth, SMS, Email, CAPTCHA<p>5. More powerful authorization (powered by Casbin), Casbin is a popular authorization solution with a lot of integrations for DBs and applications: <a href="https://casbin.org/" rel="nofollow noreferrer">https://casbin.org/</a><p>SaaS hosting is also provided at: <a href="https://casdoor.com/" rel="nofollow noreferrer">https://casdoor.com/</a> for anyone who don't want to self-host