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!
Quokka (formerly Kryptowire) - The gold standard in SAST, MAST, IAST, and more!
Google Sheets Email Marketing - Email automation and validations directly from Google Sheets
Platformly - Platformly is a suite of tools for multi-channel marketing automation.
Email Marketing: A Beginner's Guide - Master email marketing with these 3 short ebooks from Drip.
Visual Marketing Automation - An insanely fast automation builder by ConvertKit