Lago Billing - Open-source alternative to Stripe Billing and Chargebee

Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.

Metronome - Metronome helps software companies launch, iterate, and scale their usage-based business models, with billing infrastructure that works at any size and stage.

Metering.ai - Bridge the gap between product usage and Stripe billing with just 3 clicks. Meter your product’s usage and send it to Stripe without manual effort. No more billing errors or disputes due to complicated Excel calculations.

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.

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