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!
Vero Newsletters - The first "baseless" email marketing tool.
Elevatr Email Marketing Automation - Fast and easy email marketing software
Google Sheets Email Marketing - Email automation and validations directly from Google Sheets
Grade My Email - Helps you get out of the spam folder.
Email Marketing: A Beginner's Guide - Master email marketing with these 3 short ebooks from Drip.