HTTP Debugger - Debug HTTP API calls to a back-end and between back-ends. Easy of use, clean UI, and short ramp-up time. Not a proxy, no network issues!
Xamarin - Create iOS, Android and Mac apps in C#
Google Chrome Developer Tools - Get started with Google Chrome's built-in web developer tools.
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.
Fiddler - Fiddler is a debugging program for websites.
FEELingK - FLK wireless internet messaging solutions.