Stripe Billing - A set of tools for billing and subscriptions
Lago Billing - Open-source alternative to Stripe Billing and Chargebee
PayHere - Run a services business or startup? Charge recurring and one-off payments with beautifully designed payment forms. Get up and running in less than 5 minutes!
Metronome - Metronome helps software companies launch, iterate, and scale their usage-based business models, with billing infrastructure that works at any size and stage.
Square Installments - An easy way to offer monthly payment plans to your customers
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.