Multi-platform game engine similar to old Megaman with a stage editor
2D game engine for traditional platform games
A runtime-programmable, cross platform, game engine
XNA based game engine completely written in c#
A 2D game engine base on OpenGL and SDL,support for Windows & Linux
2D - 3D game engine
A retro style video game engine for RPGs and adventure games.
2D Game Engine, based on OpenGL and focused on Isometric Games
Point-and-click 2D game engine
A cross platform 3d c++ game engine
Reference implementation for the Doom game engine.