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.
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
AppFollow - AppFollow is an integrated solution that makes monitoring, analyzing, and elevating your app's reputation easy.
Growth.Design Case Studies - Product tips… in a comic book format
appfigures - Cross-platform app store analytics for all of your mobile apps.
Kickstart Side Hustle Newsletter - Dwarf-size newsletter with viral marketing case studies