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