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.
Zero to Marketing - Short case studies that help you get better at marketing
AppFollow - AppFollow is an integrated solution that makes monitoring, analyzing, and elevating your app's reputation easy.
The Creative Marketer - Techniques & tools for copywriters, marketers, and creatives
appfigures - Cross-platform app store analytics for all of your mobile apps.
Marketer Crew - Bite-size marketing lessons in your inbox