2D game engine for traditional platform games
2d/3d Game Engine
Paintown is a 2d fighting game engine.
An advanced flexible game engine for Java.
3D Game Engine
Mahasona engine is an open source game engine.
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
A Lua Game Engine
A runtime-programmable, cross platform, game engine
2D physics engine for games
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
A generic 2D engine for any kind of game
Open Source 3D Game Engine
A 2D Adventure Game & Engine
C++ 3D Game Engine
C++ OpenSource Game Fabric based on SDL2
A 2D game engine base on OpenGL and SDL,support for Windows & Linux
TurboSphere is an easy to learn and powerful JS based game engine.