Zen Worlds is an object oriented C++ virtual worlds / MMO game engine framework. This project includes Zen Engine game engine client, Zen Enterprise, an Enterprise Service Bus, and a C++ Application Server, and Zen Studio, a game development IDE.
Lienzo is a gtk-Canvas and Lua program to work in geometry. Unlike others like Cinderella, Cabri, DrGeo, etc... this one focuses in algorithms, not in static figures. the lua interface allows to work with programable objects.
CoPP is an object-oriented framework for developing algorithms for robot path planning. One of of the design goals is to make it easy to make comparisons between various path planning algorithms.