Self-hosted game stream host for Moonlight
Complete Open Source and Modular solution for MMO
Dedicated Game Server Hosting and Scaling for Multiplayer Games
Arianne is an engine to develop multiplayer online games like Stendhal
GameServer is a sophisticated, game server designed for online games
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
Nexuiz-Xonotic Client
A free Python 3 text-based MUD game server