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UserX - Mobile app analytics system
CleverTap - CleverTap offers blazing fast analytics, powerful real-time segmentation, multi-channel messaging, A/B testing and personalization in one unified solution.
Callcounter.eu - Callcounter gathers API usage data and gives you insight in trends, slow parts and errors.
Mulesoft API Portal - Anypoint API Portal takes the guesswork out of onboarding by providing a centralized place for developers to find docs, tutorials, snippets and API examples.
AppMetrica by Yandex - Free ad tracking & full-stack app analytics for mobile apps.
Apple App Analytics - Apple's very own iTunes Connect App Analytics