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
Sonar by Facebook - Extensible mobile app debugging for iOS and Android
Scanmycode - Test your code with 500+ code checks
Bird Eats Bug - Saw a bug? Send an instant replay to engineers. It will come with console logs and everything. Developers will ❤️ you.
Remote Duck - Stranger on the Internet that can help you debug your code