The Baja Engine unlocks your creative vision. Proven effectiveness and solid integration make the Baja Engine the right choice for 2d and 3d game development. Baja makes it easy for you to create a professional quality game or application.
Soya3D is an object oriented "high level" 3D engine for Python
Pysoy is a multi-threaded 3d game engine for Python. It's object-oriented API is designed for rapid game development while speed critical functions, such as physics processing and rendering, are implemented in C.
Cal3D is a skeletal based 3d character animation library written in C++ in a platform-/graphic API-independent way.
Ok many engines specifically built for many different types of games... guessing no one knows what type of engine was used to build the simplist of text based browser mmrpg games like mafia wars, war2072.com...