OpenCG is a set of libraries that implement Sowa's Conceptual Graphs (CG's). Using C++ along with the open source Boost libraries, it provides the basic representation and operations needed to develop CG applications.
Open Card Game (openCG) is a card game that is based on the collectable/trading card games such as Magic and Middle Earth. There is one major difference between openCG and other collectable card games. You make your own cards. See hompage for more info.