Official CAS Wiki - Official support area sponsored by JA-SIG, the people behind CAS. Includes links to official and unofficial clients for various languages, applications and platforms as well as other technical information.

Case Western Reserve CAS Wiki - Detailed information about CAS at Case Western Reserve University in Ohio. Includes sample code for several clients aimed at a less technical audience than the official CAS site.

Princeton CAS site - Comprehensive CAS site from Princeton. Includes integration guides for many clients and other applications as well as general CAS information and a more technical treatment of CAS and SAML

UC Davis CAS site - Includes information about using CAS with ColdFusion and ISAPI which other sites lack.