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

SaaSOptics - SaaSOptics is a cloud-based financial solution for subscription businesses providing affordable, GAAP-compliant revenue reporting.

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

Chargebee - Chargebee lets you manage subscriptions and payments at scale, handle custom recurring billing scenarios, reduce subscription churn and simplify accounting.

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

ChartMogul - Master your recurring revenue. Advanced subscription analytics with one-click.