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

Proxyclick - Connect with Confidence

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

The Receptionist - The Receptionost is a visitor managemnt solution that has visitor logging system to track visitor traffic.

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.

Envoy - Visitor registration that's changing how guests are greeted in companies around the world.