Chrome Mobile DevTools - Mobile Debugging Tools
Bugfender - Cloud logging for your apps, not only crashes matter
Bugsee - See video, network & logs leading up to bugs or crashes
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.
Dotzu - Dotzu is an in-app iOS debugging tool.
Flipboard FLEX - At Flipboard, we place a high value on tools that speed up and improve the development process.