Fully async, multithreaded, predictive, open source, 3.01 reach
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