Kyra is a simple, fully featured Sprite engine written in C++.
The Kyra engine is suited to 2D, isometric, and quasi-3D games.
It is built on top of SDL for cross platform use. It supports
tiles, sprites, and user drawn surfaces. It has full support
for alpha blending, scaling, color transformation, pixel
perfect collision detection, OpenGL acceleration, and mouse
testing. It comes with tools to define sprites and import
images into the system.

WWW: http://www.grinninglizard.com/kyra/