Bugfender - Cloud logging for your apps, not only crashes matter
Chrome Mobile DevTools - Mobile Debugging Tools
Bugsee - See video, network & logs leading up to bugs or crashes
FLEX - An in-app debugging and exploration tool for iOS.
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.
FBSonar - Sonar is a platform for debugging mobile apps on iOS and Android.