I would like to suggest another game engine for your games engines list. Here are the details of our free open source game engine:
IwGame is a well documented cross platform game engine built on top of the Marmalade SDK. It currently supports iPhone, iPad, Android (phone and tablet), Samsung Bada, Blackberry BBX (inc. Playbook), Symbian, WebOS, Windows Mobile, Mobile Linux, LG-TV, Windows Desktop and Mac OS. IwGame also contains a platform agnostic unified animating Ad API, adding support for 12 different ad providers for free game developers.
IwGame is currently hosted and maintained at http://www.drmop.com/index.php/iwgame-engine/.