Email Marketing: A Beginner's Guide - Master email marketing with these 3 short ebooks from Drip.
Startup Stash - A curated directory of 400 resources & tools for startups
Elevatr Email Marketing Automation - Fast and easy email marketing software
The Influencer Marketing Stack - Free resources to launch a killer campaign
HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
Makerbook - A directory of the best free resources for creatives