HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
RightMessage - Ask the right questions, pitch the perfect offer
Google Sheets Email Marketing - Email automation and validations directly from Google Sheets
Plainflow - Behavior-based customer journeys for your SaaS
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