An isometric arcade-style game of skill, puzzles and exploration
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Vivid is a modern C++ 3D engine using OpenGL4+
Game engine for playing tomb raider 1 - 5 levels.
Multi-platform game engine similar to old Megaman with a stage editor
Mahasona engine is an open source game engine.
A roguelike game engine/editor
3D Game engine
Small OpenGL based game enegine
Cross-platform 2D game engine