analyze.email - Test the spam-y-ness of your emails
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Canned Emails - A minimal site with prewritten emails
HelpSpace - The team inbox with super powers
DeepMail - Diligently sourced emails. Accurate emails for Startups and established companies
Drift - A messaging app that helps you grow your business.