GMass - GMass allows you to easily schedule emails, send out mass emails and mail merge campaigns and more with Gmail! Click here to learn about more features!
Templates by Email Monster - Hundreds of free, responsive email templates. Pick and edit.
Email Testing By Inbox Pirates - Preview, Analyze & Test emails with one click.
Email2Go.io - Perfect emails are born here
Hunter - Find all the email addresses related to a domain
Boost CTOR - A variety of ready-made email marketing copy templates