AppFollow - AppFollow is an integrated solution that makes monitoring, analyzing, and elevating your app's reputation easy.
AppSales - Find the best Android apps and games from Google Play that are currently discounted or free for a limited time
appfigures - Cross-platform app store analytics for all of your mobile apps.
AppRecs - AppRecs sorts through reviews in the App Store and automatically helps you filter out inauthentic results.
AppReviewBot - Get new iOS App Store and Google Play Store reviews directly in Slack, Microsoft Teams or Mattermost as soon as they happen. Unlimited apps, every country.
TheAppStore.org - Find apps by rating, price, category, updated date and more