Product Hunt Reviews Widget - Embed and encourage PH reviews into your product
Sensor Tower - Sensor Tower is a platform for app store optimization and app industry intelligence.
PaidReview - Get paid for reviewing products
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.
Review Scraper API - Reviews from 50+ sites in JSON
appfigures - Cross-platform app store analytics for all of your mobile apps.