Instabug - The top apps in the world rely on Instabug for beta testing, user engagement and crash reporting.
Buglife - Seriously awesome bug reporting for iOS apps
UserTest.io - User testing made simple. High-quality, affordable user testing solutions from real users, here in the UK. Improve your usability!
Sonar by Facebook - Extensible mobile app debugging for iOS and Android
Userbrain - Easy, fast, and affordable user testing for websites and prototypes.
Bird Eats Bug - Saw a bug? Send an instant replay to engineers. It will come with console logs and everything. Developers will ❤️ you.