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

Receiptful - Receipts that increase CLTV. Exclusive (early access to PH)

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

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

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.

Productfy - The most advanced platform for building fintech applications