Froged - One click solution providing easy-to-use marketing, sales and support services to turn website visitors into happy customers.

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

Keep Your Friends Close - A free e-book about maximizing Customer Lifetime Value

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

ChatWoot - Open-source omnichannel customer engagement 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.