Unity3D Client And C# Server Framework
One framework for creating powerful cross-platform games
Real Time Strategy game engine supporting early Westwood classics
Open Source MMORPG Framework
CTFs as you need them
You can make it - Open Source MMORPG Platform
Arianne is an engine to develop multiplayer online games like Stendhal
Game engine supporting many 3D/2D formats and graphic effects
INSTEAD - Simple Text Adventure Interpreter.
JavaScript framework to build game engines, games, emulators and apps
Java Settlers
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
A synchronisation component for p5.js
2D game engine for traditional platform games
.NET - VISUAL BASIC NVIDIA +ATI PHYSX SLIMDX DIRECTX 9 -ENGINE/WRAPPER
computer simulation for my raspberry pi
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
Multi-threaded 2D Renderer licensed under the Mozilla Public License
C++ game libraries plus server.