Animation Compression Library
Multi Theft Auto is a game engine
Solar2D Game Engine main repository (ex Corona SDK)
Cross-Platform C++ 2D/3D game engine
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
Powerful, mature open-source cross-platform game engine for Python
Open-source engine for Heroes of Might and Magic III
A simple math library for games and computer graphics
2D game development library for Ruby and C++
A cross-platform, open-source, pure C game engine for mobile game
The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
A .NET ascii/ansi console engine written in C# for MonoGame and XNA
Urho3D Game engine
New Godot bindings for Swift
RPG Maker 2000/2003 and EasyRPG games interpreter
A multi core friendly rigid body physics and collision detection lib
A pure Go game engine
A simple tool to allow Chessmaster 10/11 bot customizations
Go 3D Game Engine
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
RTSish Game Engine
A fast, scalable, distributed game server engine/framework for C++
A 2D game engine and level editor
Low-Level Game Engine for Retro Platforms
Portable game engine with main focus on point-and-click adventures