Sensor Tower - Sensor Tower is a platform for app store optimization and app industry intelligence.
Crunchbase - Crunchbase is a platform for discovering industry trends, investments, and news about companies around the world.
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.
CB Insights - CB Insights is a company database for the venture capital and corporate development community.
appfigures - Cross-platform app store analytics for all of your mobile apps.
Owler - Owler is a crowdsourced data model allowing users to follow, track, and research companies.