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

Clientjoy.io - Productivity OS for Agencies & Freelancers | All-in-one crm to Manage Sales Pipeline, Clients, Appointments, Mailbox, Create Proposals, Contracts, Invoices, collect Payments & run Email Sequences.

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

Albacross - The world's first free B2B Lead Generation Network. Albacross help companies master their B2B digital marketing with Lead Generation and targeted marketing

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.

mightysignal - The engineer's approach to lead generation.