This tutorial is designed to help a new CAS user to set up the Apereo CAS server and client to their applications. The code of this tutorial is open-sourced on GitLab. What’s CAS? Enterprise Single Sign-On - CAS provides a friendly open source community that actively supports and contributes to the project. While the project is rooted in higher-ed open source, it has grown to an international audience spanning Fortune 500 companies and small special-purpose installations.