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

DocsCloud - Simplifying Documentation

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

RevenueWire - RevenueWire Commerce enables turnkey ecommerce, payments and subscription management through a cloud-based platform.

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.

Commission Junction - CJ Affiliate by Conversant (formerly Commission Junction)