Sparrow is an open source game engine for iOS that is a objective-c library for iOS products with features that includes sprite sheets, partical effects, and more.
Starling Framework is an open source cross platform ActionScript library for Adobe Flash that recreates Flash's display list architecture on GPU that runs in the browser and on all mobile platforms.
Flox is a cloud based back-end for your game that enables you to manage release dates, growth, and solve problems.