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Killbill - Open-Source Subscription Billing and Payment Platform
Plasso.com - Payments made simple. Sell subscriptions & products online.
involve.me - involve.me is a lead funnel builder used by companies to boost online conversions. Interactive flows within the funnels help guide, qualify and capture leads.
Chargebee - Chargebee lets you manage subscriptions and payments at scale, handle custom recurring billing scenarios, reduce subscription churn and simplify accounting.
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.
Quorum - Quorum provides tools to create outreach efficient, effective and people-centered field actions.