Kallithea is an open-source, web-based source code management system that supports both Mercurial and Git version control systems. It offers features such as code review, repository management, and collaboration tools to facilitate the development process. Designed to be user-friendly and flexible, Kallithea is suitable for individuals, teams, and organizations looking for a free alternative to proprietary version control solutions. The platform is known for its robust access control and permission management features, making it a secure choice for managing code repositories.