BareMetrics - SaaS Analytics for Stripe
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
ChartMogul - Master your recurring revenue. Advanced subscription analytics with one-click.
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
ProfitWell - SaaS Metrics for Stripe. Absolutely Free.
HelpScout - Help Scout is a simple, straightforward way to provide excellent support