Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.
Kite - Kite helps you write code faster by bringing the web's programming knowledge into your editor.
Buglife - Seriously awesome bug reporting for iOS apps
Rage Grade by FullStory - Benchmark your customer frustration
Sonar by Facebook - Extensible mobile app debugging for iOS and Android
DevDojo - Dev tools and resources for building awesome stuff