SurveyMonkey Intelligence - Usage and download metrics for all mobile apps
DataTip - The fastest way to store & access your critical datapoints.
Apple App Analytics - Apple's very own iTunes Connect App Analytics
HeyForm - Paperless data collection with better data insights
CleverTap - CleverTap offers blazing fast analytics, powerful real-time segmentation, multi-channel messaging, A/B testing and personalization in one unified solution.
Immutable.js - Immutable persistent data collections for Javascript which increase efficiency and simplicity. - immutable-js/immutable-js