Open Source MMORPG Framework
Experimental PlayStation Vita emulator
FlightGear Flight Simulator: free open-source multiplatform flight sim
Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
A cross-platform 2D game engine
An OpenGL client-server game
A planetarium software that shows a 3D simulation of the night sky
starrydb is game server engine
Android, DOS, FirefoxOS, Linux, MacOS and Windows all in one..
Runes Of Magic
plugin-based RPG manager in C++ and Qt5
LUR is a Rebuild of Lego Universe created in Uneral 4.
My LEGO Universe Server
A turn-based multiplayer shooting game in the style of Worms
Star Trek Web browser game
Develop an emulated Darkfall Online Server.
Up to date MUD client evolved from the original MudMaster
An OpenSource (C# .NET) TeamPlay Environment.