Dedicated Game Server Hosting and Scaling for Multiplayer Games
GameServer is a sophisticated, game server designed for online games
Arianne is an engine to develop multiplayer online games like Stendhal
Lucifer: The Ultimate Dev-Ecosystem
A fast, scalable, distributed game server engine/framework for C++
Massive Multiplayer Online Wargame Leveraging the Internet
starrydb is game server engine
Massively multiplayer online game server and client framework
Nexuiz-Xonotic Client