Desktop/Android/HTML5/iOS Java game development framework
Orx: Portable Game Engine
TX Library is a tiny graphics library for Win32 written in C++.
A free 3D game engine to create games and realtimes scenes for Windows
2D Game Engine
A cross platform Lua based game engine
A 2D game engine and level editor
Cross-platform 2D and 3D game engine
Free and Open Game Programming Language for Windows and GNU/Linux
2D ARPG Engine
Open-source, cross-platform, C++ game engine for creating 2D/3D games
2D game engine for traditional platform games
Gaming library
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
A generic 2D engine for any kind of game
A 2D Adventure Game & Engine
A 2D game engine base on OpenGL and SDL,support for Windows & Linux
Multi-threaded 2D Renderer licensed under the Mozilla Public License
2D Game Engine, based on OpenGL and focused on Isometric Games
A game development kit for Sifteo Cubes.
A retro style video game engine for RPGs and adventure games.
3D game engine for C and C++