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

Clinked - White-label Client and Team Workspace

Recurly - Subscription billing and recurring billing management. Recurly offers enterprise-class subscription billing for thousands of companies worldwide.

Slack - A messaging app for teams who see through the Earth!

Zuora - Zuora creates cloud-based software on a subscription basis that enables any company in any industry to successfully launch, manage, and transform into a subscription business.

SuiteDash - Integrated & Automated Client Portal Software : Secure Web Based Client or Customer Login Portals : White Label SaaS Project Management System, Online CRM Tool, Browser Based Invoicing & Recurring Billing, Time Tracker, Client File Upload, , All in …