eCyberpunk is a Java version of the R Talsorian Games' Role playing system, Cyberpunk 2020 and it's supplements. Initially, the project will focus on GM aids, but may, in the future, be a full-blown game.
The Freya Game Engine is a cross platform Java API for writing multiplayer turn based games. The engine produces XML turn descriptions based on XML command files and XML data dictionaries.
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AtreyuMS is a server emulator which replicates the functionality of a MapleStory server. The emulator is cross-platform compatible since it is coded in Java.