Recurly - Subscription billing and recurring billing management. Recurly offers enterprise-class subscription billing for thousands of companies worldwide.
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Payolee - Automate your business with recurring billing software. Increase customer retention with Payolee, and grow your subscription business.
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
Billtrust - Billtrust Connects our Clients with their Cash and their Customers.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.