Full featured MUD server with all the trimmings.
The multiplayer game engine
State Management and Multiplayer Networking for Turn-Based Games
A Forge mod that implements SpongeAPI
A simple 2D-Chess
The famous Maze War game recreated as a modern web application.
Cross platform administration tool for Source Engine dedicated servers
The original Xivio.com World Server Core
Spykee Control Interface in Java
A free Python 3 text-based MUD game server
Multi-user whiteboard emphasizing simplicity.
A php script for generating Rubik's cube visualisations