Chrome Mobile DevTools - Mobile Debugging 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.
HttpWatch - HttpWatch: The ultimate HTTP Sniffer for Chrome, IE and iOS
Bugsee - See video, network & logs leading up to bugs or crashes
Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.
GapDebug - GapDebug is a comprehensive mobile debugging tool that bridges the gap left by other debugging options.