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.

Analytics Academy by Segment - Bite-sized lessons to become an analytics expert.

AppFollow - AppFollow is an integrated solution that makes monitoring, analyzing, and elevating your app's reputation easy.

Ask GA - Get answers for your marketing questions based on GA data

appfigures - Cross-platform app store analytics for all of your mobile apps.

Marketing Resources List - The biggest collection of free marketing resources