Sensor Tower - Sensor Tower is a platform for app store optimization and app industry intelligence.
AppAgg - Application Aggregator
App Annie - App Annie is a marketing analytics tool available for apps of all kinds. With App Annie, you can track sales, traffic, and a variety of other factors pertinent to monitoring an app's trajectory.
AppRecs - AppRecs sorts through reviews in the App Store and automatically helps you filter out inauthentic results.
appfigures - Cross-platform app store analytics for all of your mobile apps.
Fnd - Browse Apple App Store and iTunes on the Web