App Launch Checklist - Planning tool for launching your app successfully
BetterAppIcons for iPhone - Create your unique app icon today.
ASO Tools by AppFollow - Tools for App Store Optimization in App Store & Google Play
AppScreens - Mockup professional-grade screenshots for your Apple and Android apps simultaneously. Designer quality, made simple.
ConversionChecklist.org - A 41 point checklist to make your website convert better
SplitMetrics - SplitMetrics is the A/B testing platform for App Store and Google Play page to discover the most converting icons, screenshots, video, etc.