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

Ignition App - Reclaim time, profitability and cash flow with Ignition by automating proposals, billing, payment collection and workflows in a single platform.

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

Proposify - A simpler way to deliver winning proposals to clients.

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.

GoProposal - GoProposal is software that gives a consistent and transparent approach to pricing.