SIREN.io - Siren is an investigative intelligence platform.

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

Lampyre - Lampyre - an efficient data analysis and OSINT multi-tool for everyone.

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

dradis - Dradis is the open-source reporting and collaboration tool for IT security professionals.

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.