Localytics - App analytics and marketing for iPhone, iPad, Android, HTML5, Blackberry and Windows apps.

Stripe - Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for online businesses of all sizes. Use Stripe’s payment platform to accept and process payments online for easy-to-use commerce solutions.

Liftoff.io - eCommerce & web to print platform

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

Widdit - Widdit provides tools that help app developers create an interactive online experience for users on both PC and mobile ecosystems.

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