Email2Go.io - Perfect emails are born here
Transactional Email Templates by Postmark - Open source email templates for use in your SaaS app.
Cluck - An early warning system for scams and fraud on Craigslist
SaaS Email Templates - Responsive HTML email templates for SaaS startups
reShape-Craigslist - Craigslist made beautiful
Great Email Templates - HubSpot email templates for SaaS marketers