Killbill - Open-Source Subscription Billing and Payment Platform
Stripe Billing - A set of tools for billing and subscriptions
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.
Kable - Instant messaging for business
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 Stripeโs payment platform to accept and process payments online for easy-to-use commerce solutions.