Mahasona engine is an open source game engine.
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Egret is a brand new open mobile game and application engine
Educational framework for OpenGLES, OpenCL and OpenAL
A generic 2D engine for any kind of game
3D Game engine
C++ OpenSource Game Fabric based on SDL2
Free Android 2D OpenGL Game Engine
2D - 3D game engine
Open source, moddable game engine for the "Polygon Love 2" game
Little game background framework in java.
Java Client + JS/Canvas Server-Side System, with maintained Objects
"Abysmal Depths" is a simple C++-based text adventure game engine.
Java game engine for shoot 'em ups, using Java2D.
Cross-platform 2D game engine
A cross platform 3d c++ game engine
A simple WinAPI game engine
Zap Engine