Datenwerk is an MIT licensed cross-platform C library aiming to provide an introspective data model (IDM) API for applications. It is best suited for use within music, 3D, vector graphics, scene, video and game editors. Bindings for C++ and Python are included.
Founded 2011, Datenwerk is still a rather young project, so be prepared for a bumpy ride. Issue reports and patches are still greatly appreciated.
We currently use IRC for communication. Meet us on freenode, channel #datenwerk.