CoffeeMud is a text-based virtual reality game engine (a MUD). It is a mature, full-featured Java codebase. It includes web (HTTP) and email (SMTP) servers, chat (IMC2 and I3) and web clients, and supports ANSI, MXP, and MSP.
Cross-platform 3D Game Interpreter for 3D design games simulation and Virtual Reality Graphics Rendering with GUI and Command Line. Include map editor , game modeler , script editor.