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.
SolidInvoice - SolidInvoice is simple to use online invoicing software that helps small businesses to get paid faster on time.
Chargebee - Chargebee lets you manage subscriptions and payments at scale, handle custom recurring billing scenarios, reduce subscription churn and simplify accounting.
JustOn - JustOn offers electronic billing and invoicing solutions.
Recurly - Subscription billing and recurring billing management. Recurly offers enterprise-class subscription billing for thousands of companies worldwide.
Upodi - Unified Commerce Platform.