Full featured MUD server with all the trimmings.
A simple cross-platform game engine for creating old-school 2D games
A mobile game distributed server implemented using netty4.X
Multi-threaded game engine for Android
An online multiplayer turn based strategy game and board game engine.
A multiplatform game engine for interactive fiction experiences
UtiliGame is a light-weight game engine written in Java.
A game engine in java for 2D strategy games
Demonstrating the features of jMonkeyEngine 3.
Free MMORPG Engine. Develop and host graphical browser-based games.