App Launch Checklist - Planning tool for launching your app successfully
DeHashed - DeHashed is the largest & fastest data breach search engine.
ASO Tools by AppFollow - Tools for App Store Optimization in App Store & Google Play
LeakCheck - Data breach search engine, low price starting from $10/mo, one email address for free, unlimited API, 7B+ entries
ConversionChecklist.org - A 41 point checklist to make your website convert better
have i been pwned? - Check if your account has been compromised in a data breach