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.
Clearbit - Clearbit provides Business Intelligence APIs
AppFollow - AppFollow is an integrated solution that makes monitoring, analyzing, and elevating your app's reputation easy.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
Sensor Tower - Sensor Tower is a platform for app store optimization and app industry intelligence.
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.