Gideros Release version
Arianne is an engine to develop multiplayer online games like Stendhal
An environment to develop games based on a rectangular board
Java decentralized cross-platform network multiplayer game engine
Built to be ease of use, with no programming knowledge, Multi-platform
Free strategy browsergame engine.
A game engine in java for 2D strategy games
AMOS BASIC reimplementation in Java
The next generation mud is an open-source extensible, programmable mud