Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
OneSignal - Customer engagement platform used by over 1 million developers and marketers; the fastest and most reliable way to send mobile and web push notifications, in-app messages, emails, and SMS.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
Mixpanel - Mixpanel is the most advanced analytics platform in the world for mobile & web.
HelpScout - Help Scout is a simple, straightforward way to provide excellent support
Countly - Product Analytics and Innovation. Build better customer journeys.