Arianne is an engine to develop multiplayer online games like Stendhal
LGSL (Live Game for PHP 5.4-8+: online status for various gameservers
A fast, scalable, distributed game server engine/framework for C++
Free MMORPG
Play old LAN games across the world!
Massively multiplayer online game server and client framework
Web based Game server control panel
Windows Tool to check your ping before a game for League of Legends.
An easy to use and powerful game control panel
Nexuiz-Xonotic Client
Proxy for games that emulates network conditions like ping and lag.
Shaiya Infinity Game Client
Create your own online real-time browser-based MMO in your website
c# game server framework