Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
MJML - The open source framework for responsive emails
Pistachio Email Templates - Delicious newsletter templates built for automation
BeeFree - BeeFree is an all-in-one solution that works anywhere you are.
Gmail Email Templates by cloudHQ - Copy a successful company's email template in 1 Click
Elite Email - Drag & drop email builder for awesome newsletters