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.
SmallDevTools - Handy developer tools with a delightful interface
AppFollow - AppFollow is an integrated solution that makes monitoring, analyzing, and elevating your app's reputation easy.
whatdevsneed - This is whatdevsneed.
appfigures - Cross-platform app store analytics for all of your mobile apps.
Google Open Source - All of Googles open source projects under a single umbrella