Arianne is an engine to develop multiplayer online games like Stendhal
Full featured MUD server with all the trimmings.
X3D is the open-standard format for 3D graphics scenes on the Web.
State Management and Multiplayer Networking for Turn-Based Games
A Rust framework for building Minecraft servers
Chess program
8-bit Graphical API for Java
Source code of the chapters of the book 3D Game Development with LWJGL
SJCE - free portable cross-platform graphical chess game, 100% Java.
Build Cross-platform Applications
RPG character generator for RPG d20 systems.
Extensive Java chess database libraries.
Java Chess Engine
A chess like board game
Project to create a Java based SCUMM engine.