Bird Eats Bug - Saw a bug? Send an instant replay to engineers. It will come with console logs and everything. Developers will ❤️ you.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Bugfender - Cloud logging for your apps, not only crashes matter
BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.
Marker.io - Visual feedback and bug reporting tool for websites
MIT App Inventor - App Inventor is a cloud-based tool, which means you can create apps for phones or tablets right in your web browser.