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

Tendenci - Tendenci - The Open Source AMS is a cloud-based​ all-in-one management SaaS solution for Non-profits and Associations.

Chargify - Chargify is the best online billing software for all of your Recurring Billing needs. Learn more about simplifying your Subscription Billing today.

JeraSoft - JeraSoft develops of high-end billing, rating, routing and mediation solutions for Communication Providers (Mobile VoIP, Retail and Wholesale VoIP, SMS, MVNO/MVNE/MNO, and OTT Providers), Internet of Things Providers and Internet Service Providers.

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

WildApricot - WildApricot is a powerful cloud software to help you automate and simplify membership tasks.