Open Game Bootstrap
An advanced flexible game engine for Java.
3D Game Engine
Java decentralized cross-platform network multiplayer game engine
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Cross platform Game Creation Software
Cross-platform C framework very compact libraries and tools.
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
Educational framework for OpenGLES, OpenCL and OpenAL
A generic 2D engine for any kind of game
Multi-threaded 2D Renderer licensed under the Mozilla Public License
Pygrid is an open-source and cross-platform pygame/python 2D engine.
A cross-platform game framework based on OpenGL and GObject.
A retro style video game engine for RPGs and adventure games.
A truly extensible cross-platform game engine
C-Lesh is a game programming language for 2D games.
An extensible development framework for roleplay games.
cross-platform 2d game engine
Powerful html5 & javascript library for creating applications & games.
Cross-platform reimplementation of AMOS BASIC (runtime)
Formerly CraveJs, it's for creating JavaScript applications and games.