GoodUI Evidence - People's A/B test results that show which UI ideas work best
Chrome Mobile DevTools - Mobile Debugging Tools
Decidr - Make better decisions with quick A/B polls
Bugsee - See video, network & logs leading up to bugs or crashes
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.
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.