Arianne is an engine to develop multiplayer online games like Stendhal
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
Java Settlers
Playing Go with web-based turn-based Go server
oGame-like browser space realtime strategy game based on xNova
Cosmos Tycoon is a open source transport simulation browser game.
plugin-based RPG manager in C++ and Qt5
MOVED OUT OF SOURCEFORGE - Server software for Minecraft PE
web cms for clans and esport related pages
Source for the Flash-based Glitch client
Minecraft private Skin Center
Blightscape is a Private server for runescape
Free MMORPG Engine. Develop and host graphical browser-based games.