SurveyMonkey Intelligence - Usage and download metrics for all mobile apps
5play.ru - 5play.ru enables you to download highly-rated Apps and Games for Android devices.
Apple App Analytics - Apple's very own iTunes Connect App Analytics
Altstore - A home for apps that push the boundaries on iOS
CleverTap - CleverTap offers blazing fast analytics, powerful real-time segmentation, multi-channel messaging, A/B testing and personalization in one unified solution.
iOSGODS! - iOSGODS!