Xamarin - Create iOS, Android and Mac apps in C#
Kinetise - Visual Programming of Custom Mobile Apps
Xcode - Xcode is Apple’s powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Kony - Kony is a mobile application application development platform that facilitates companies to deliver innovative mobile solutions.
GoodBarber - GoodBarber is a mobile app creation platform.