Refined Twitter - A browser extension that improves the Twitter experience

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

PayPal Prepaid - PayPal Prepaid is a best-in-class platform that smoothly manages every aspect of your account with complete accuracy.

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

Greendot - Easily manage and access your money with Greendot at any time.

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.