Вот, подборка с
http://www.adrianparr.com/?p=83
покопайтесь, там есть и опенсорс
as3isolib - An open-source ActionScript 3.0 Isometric Library
http://as3isolib.wordpress.com/
FFilmation - AS3 Isometric Engine
http://www.ffilmation.org/
isoengineas3 - Flash Isometric Engine AS3
http://sourceforge.net/projects/isoengineas3/
OpenSpace - Commercial
http://www.openspace-engine.com/
Sean Cooper Isometric Engine - Commercial
http://www.games.seantcooper.com/IsometricEngine.aspx
TheoWorlds - Commercial
http://www.theoworlds.com/products.php
T.I.L.E. (Tangerine Isometric Level Editor) - Commercial
http://www.tangerinepop.com/ then click on “TECH”