There are several open-source and commercial alternatives to Keycloak that offer identity and access management capabilities. Here are a few options:
Gluu: An open-source IAM solution that provides features such as single sign-on, multi-factor authentication, and authorization. Gluu supports a variety of protocols and standards, including SAML, OpenID Connect, and OAuth 2.0.
Auth0: A cloud-based identity management platform that provides features such as single sign-on, passwordless authentication, and social login. Auth0 supports a range of protocols and standards, including SAML, OpenID Connect, and OAuth 2.0.
Okta: A cloud-based IAM platform that provides features such as single sign-on, multi-factor authentication, and user lifecycle management. Okta supports a variety of protocols and standards, including SAML, OpenID Connect, and OAuth 2.0.
Ping Identity: A commercial IAM platform that provides features such as single sign-on, multi-factor authentication, and API security. Ping Identity supports a range of protocols and standards, including SAML, OpenID Connect, and OAuth 2.0.
ForgeRock: An open-source IAM platform that provides features such as single sign-on, multi-factor authentication, and user lifecycle management. ForgeRock supports a variety of protocols and standards, including SAML, OpenID Connect, and OAuth 2.0.
Shibboleth: a mature and widely used federated identity management system that is primarily focused on web single sign-on and attribute-based access control. It is based on the Security Assertion Markup Language (SAML) standard and provides a range of tools and libraries for implementing federated identity solutions
saaspass.com: a cloud-based identity and access management solution which offers a range of security features, such as security analytics, audit trails, and device trust