BareMetrics - SaaS Analytics for Stripe
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Salesforce Data.com - Data.com provides company profiles and contact information across millions of businesses worldwide.
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
Stunning - Dunning emails, failed payments, churn prevention, event notifications, custom HTML receipts and more for Stripe subscriptions, with iPhone app and push notifications
HelpScout - Help Scout is a simple, straightforward way to provide excellent support