The RML project is working on a way of designing rulesets for games, virtual worlds and other simulations. It aims to enable design at a much higher level than is currently available and make it accessible to the more artistically inclined designer.
An adaptable program meant for design of 2D or pseudo-3D role-playing games using a minimum of programming. Users can create new resource types and get automatically generated editors for them, as well as write scripts to be run by the engine.