Olyo - Direct marketing via Facebook Messenger
Email Marketing: A Beginner's Guide - Master email marketing with these 3 short ebooks from Drip.
Programming for Marketers - Free email course for wannabe technical marketers
HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
Job Promotion Course - Step-by-step promotion guide in a free 7-day email course
Google Sheets Email Marketing - Email automation and validations directly from Google Sheets