Sensor Tower - Sensor Tower is a platform for app store optimization and app industry intelligence.

erxes Inc - Merge all your marketing, sales and customer service tools into one platform for greater output.

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.

Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.

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

Startup Stash - A curated directory of 400 resources & tools for startups