Fat Free CRM is an open-source customer relationship management (CRM) application designed for small businesses and focused on simplicity and ease of use. Built on the Ruby on Rails framework, it offers a lightweight solution with essential CRM features such as contact management, opportunity tracking, lead management, and task management. The platform is customizable and extensible, allowing users to adapt it to their specific business needs. It is community-driven, with ongoing contributions and support from developers and users who value flexibility and efficiency in managing customer relationships.