APPlyzer - Professional rankings & keywords for app developers, marketers and publishers.
The Influencer Marketing Stack - Free resources to launch a killer campaign
Segment Sources - Load CRM, billing, and other cloud data to your Warehouse
Startup Stash - A curated directory of 400 resources & tools for startups
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.
Makerbook - A directory of the best free resources for creatives