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

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.

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

Lotus - Canvas for drawing in real-time with others around the world

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.

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.