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.

Heurix.io - Heurix is a free heuristic evaluation tool that helps you work out how to improve your website.

Sensor Tower - Sensor Tower is a platform for app store optimization and app industry intelligence.

UX Companion - A handy glossary of UX theories, tools and principles (iOS)

App Store Optimization (ASO) Checklist - ASO tools for increasing app installs & organic traffic 📈

Heurio - Do website reviews faster. Heurio eliminates the administration process and lets you focus on creating value in a collaborative and user-friendly way. Perfect for heuristic evaluation, design and development review, bug report, QA testing and more.