Apereo Central Authentication Service (CAS)

Apereo CAS is a cutting-edge multilingual single sign-on (SSO) solution and open-source identity provider that supports authentication and authorization for the web and seamlessly integrates with existing infrastructure, establishing a unified authentication point for users across diverse applications. Apereo CAS also provides advanced security measures, offering session management, single logout, and passwordless multi-factor authentication.

While the project originated out of postsecondary education institutions, and thus is broadly used in higher education today, it has evolved into a globally recognized solution. Trusted by Fortune 500 companies and across industries – government, finance, healthcare, gaming, education, and more – CAS has a proven track record of capabilities that cater to entities of varying sizes and sectors.

Apereo CAS is not just a solution; it's a vibrant community committed to progress. As a completely free and open-source platform under a permissive license, CAS invites collaboration and innovation by all.

Project Statistics (from late 2023):
First Release, Dec. 2004; 2023 Release Dec. 2023, v7; Current Release, Jun. 2024, v7.0.4.1
Contributors: 321
Commits: 59919 (Lifetime); 3326 (2023); Year-over-year, 26.75%
Issues: 460 (Lifetime); 10 (2023); Year-over-year,-23.08%
Reviews: 6752 (Lifetime); 715 (2023); Year-over-year, 39.11 %
Commit authors: 668 (Lifetime); 45 (2023); Year-over-year, -15.09%
Issue submitters: 339, (Lifetime); 10 (2023); Year-over-year, -23.08%
Review submitters: 752 (Lifetime); 54 (2023); Year-over-year, -6.9%
Estimated number of sites in use: ≈ 12,000
GitHub stars & bookmarks: ≈ 11K