KOF 91 is a 2D fighting game engine written in C with Allegro. It compile on Windows and Linux (maybe FReeBSD, Mac OS X).
User can configure the way the engine act easely.
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.