Arianne is an engine to develop multiplayer online games like Stendhal
Your collection, your way
Analysis of Oware (Abapa) games
The multiplayer game engine
Java Settlers
Playing Go with web-based turn-based Go server
starrydb is game server engine
plugin-based RPG manager in C++ and Qt5
A turn-based multiplayer shooting game in the style of Worms
The IRC's Talking Robot
web cms for clans and esport related pages
The original Xivio.com World Server Core
Modular Minecraft server plugin - commands, events, ...
Game framework on top of Python, Panda3D and Twisted