The Tiny JavaScript Game Engine That Can!
Open Source MMORPG Framework
Experimental PlayStation Vita emulator
Free, open source game engine online
Python package useful to retrieve and manage the data of IMDb
Azuriom is a complete open-source web solution for game servers
CTFs as you need them
Web application brings custom skins back in offline Minecraft servers
FlightGear Flight Simulator: free open-source multiplatform flight sim
LGSL (Live Game for PHP 5.4-8+: online status for various gameservers
The ultimate cataloguer
Arianne is an engine to develop multiplayer online games like Stendhal
Online War system for IL-2 Sturmovik and Iron Front in ArmA 2
Analysis of Oware (Abapa) games
Full featured MUD server with all the trimmings.
JavaScript framework to build game engines, games, emulators and apps
Free and open source Avatar Webgame made by Vietnam
Java Settlers
Classic America's Army
XML-based framework for developing games
Teach your students how to figure out tricky texts in any language.