OpenAncestry is a genealogical management tool written in C. It uses GTK+ for the interface, and it supports SQLite as the database. It is modular and allows other database interfaces to be written through its plugin architecture.
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.