FusionAuth is a popular open-source authentication solution that helps developers meet their authentication needs. Jerry Hopper, a freelance application developer and system engineer, uses FusionAuth in his personal projects and work projects to manage user identities and authenticate users. He appreciates the ease of use, flexibility, and GDPR compliance features provided by FusionAuth. Jerry's experience with FusionAuth has saved him time and headaches compared to other authentication solutions, such as Apereo/CAS or PHP OAuthServer. He believes that FusionAuth's API-driven approach and complete logging make it a breeze to implement in applications, especially for GDPR compliance.