One of the best Prodigy hacks
Full featured MUD server with all the trimmings.
The ultimate cataloguer
JavaScript framework to build game engines, games, emulators and apps
LGSL (Live Game for PHP 5.4-8+: online status for various gameservers
The multiplayer game engine
State Management and Multiplayer Networking for Turn-Based Games
Java Settlers
A Forge mod that implements SpongeAPI
Playing Go with web-based turn-based Go server
Cosmos Tycoon is a open source transport simulation browser game.
A simple 2D-Chess
The famous Maze War game recreated as a modern web application.
Cross platform administration tool for Source Engine dedicated servers
web cms for clans and esport related pages
The original Xivio.com World Server Core