FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
BareMetrics - SaaS Analytics for Stripe
Clearbit Connect - Clearbit Connect is a free extension that surfaces actionable information on the people who email you.
Salesforce Data.com - Data.com provides company profiles and contact information across millions of businesses worldwide.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
Stunning - Dunning emails, failed payments, churn prevention, event notifications, custom HTML receipts and more for Stripe subscriptions, with iPhone app and push notifications