Give by Cell - Give by Cell is the nation’s leading provider of mobile fundraising solutions to non-profit organizations with more than 2,500 clients.

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

MobileCause - Online event and fundraising management for nonprofits

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.

Blackbaud Online Express - Simple, smart online donation & fundraising software. Easily manage emails, events, donation forms, reporting & more. Get more info here & get started now.

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