Gaming

• JellyCar 2 ($0.99)

• The Impossible Quiz! ($0.99)

• Bejeweled 2 ($2.99)

• 14-in-1 Gamebox($0.99)

• Call of Duty: World at War Zombies($9.99)

• Metal Gear Solid Touch ($0.99)

• Skee-Ball ($0.99)

• Tap Tap Revenge 3 ($0.99

• Surviving High School($2.99

• Doodle Jump ($0.99)

Free vector graphics editor and physics engine with graphical interface make designing games for cocos2d simpler.

Inkscape: http://www.inkscape.org/
An Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format.

Box2D: http://www.box2d.org/index.html
Physics engine with graphical feedback

cocos2d framework: http://code.google.com/p/cocos2d-iphone/