yat stands for Yet Another Todolist (manager). Its first objective is to provide an easy-to-use CL interface, as well as an API to facilitate the development of other interfaces (GTK, Web, etc.).
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.