Odamex is a free, cross-platform, modern client-server Doom engine
TKD Scoring Wi-Fi Server supporting Android and IPhone clients
LGSL (Live Game for PHP 5.4-8+: online status for various gameservers
Free MMORPG
Cosmos Tycoon is a open source transport simulation browser game.
starrydb is game server engine
Simple meta-server for locating other multiplayer servers
A simple 2D-Chess
canarymod plugin to play capture the flag on minecraft
Java decentralized cross-platform network multiplayer game engine
MOVED OUT OF SOURCEFORGE - Server software for Minecraft PE
breakout/arkanoid clone multiplayers network game at 360°!
Star Trek Web browser game
web cms for clans and esport related pages
The original Xivio.com World Server Core
Minecraft private Skin Center
GraphOX is awesome
Proxy for games that emulates network conditions like ping and lag.
Modular Minecraft server plugin - commands, events, ...
Tools for installing and setting up dedicated Battlefield servers