HubSpot CRM - Free CRM software for small businesses.
Sensor Tower - Sensor Tower is a platform for app store optimization and app industry intelligence.
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.
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.
Bexio - Bexio helps small businesses manage their accounting, contacts and inventory.
appfigures - Cross-platform app store analytics for all of your mobile apps.