Zendesk - Zendesk is a beautiful, lightweight help-desk solution.

ClearBrain - Predict which users will upgrade or churn tomorrow.

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

Baremetrics Dunning & Retention - Automatically collect on failed charges in Stripe

HelpScout - Help Scout is a simple, straightforward way to provide excellent support

ChurnBuster - Stop Losing Money toFailed Payments in Stripe. Churn Buster saves you thousands of dollars every month by ensuring your customers update their payment information.