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

BillMonk - Billmonk lets you keep track of debts between friends.

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

PocketGuard - PocketGuard categorizes and organizes your expenses, monthly bills and subscriptions into clear, beautiful tabs and graphs, so you will always be on top of your finances.

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.

EveryDollar - Budgeting and expense tracking app