Apereo CAS

apereo.github.io · checked 3 Oct 2026

#8 · OAuth Server Software

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How it plugs in

—Public API

NoOpen source

YesFree tier

Signal on OAuth Server Software6.4#8 of 32

CAS is an enterprise multilingual single sign-on solution and identity provider for the web, with authentication and authorization capabilities.

Pricing

Apereo CASOpen-source Java server; deployment and configuration require technical setupFree

As github.com lists them, checked 3 Oct 2026.

Near it

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: apereo.github.io
Price: Free tier
Free trial: No
Authentication: Authentication sources include LDAP, databases, X.509, SPNEGO, JAAS, JWT, RADIUS, and MongoDB.
Client support: Official clients are listed for .NET, Java, PHP, and Apache; Spring Security, Apache Shiro, and Pac4j have built-in framework support.
Containers: Apereo publishes Docker images with each software release, while describing them primarily as quickstarts and demos.
Delegated authentication: CAS can delegate authentication to external identity providers including ADFS, Facebook, Twitter, SAML2 identity providers, and OpenID Connect providers.
Deployment: CAS is a Java web application that requires JDK 25 for building and deployment according to its installation requirements.
Integrations: CAS has built-in integrations for many SAML2 service providers, with configuration recipes that can automate service registration and attribute-release settings.
License: The project’s GitHub page describes Apereo CAS as free open-source software licensed under Apache v2.
Monitoring and audits: CAS can monitor application and system behavior, statistics, and metrics in real time, and centrally manage audits and logs.
Multifactor authentication: CAS supports multifactor authentication providers including Duo Security, FIDO2 WebAuthn, Google Authenticator, and Inwebo.
Open source: The primary implementation is an open-source Java server component.
Operating systems: The installation requirements state there is no particular operating-system preference, though Linux-based installations are more common than Windows.
Paid support: The project says commercial support is available through Apereo commercial service providers, but does not list prices on this support page.

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