Unity3D Client And C# Server Framework
ThinkPHP Framework
One framework for creating powerful cross-platform games
Open Source MMORPG Framework
CTFs as you need them
Open source library for creative expression on the web, desktop, etc.
You can make it - Open Source MMORPG Platform
Gideros Release version
Arianne is an engine to develop multiplayer online games like Stendhal
JavaScript framework to build game engines, games, emulators and apps
Java Settlers
Sdk library for creating 2048 game in c#.
Mad Vandal's FortressCraft Mod Source Code
A synchronisation component for p5.js
2D game engine for traditional platform games
Single-/multi-player card game Mau Mau (similar to UNO®)
Java decentralized cross-platform network multiplayer game engine
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Basic JAR&ZIP changing script
C++ game libraries plus server.
Open Source Virtual World and MMOG Development Platform