Content Marketing Stack - A curated directory of content marketing resources
Email Marketing: A Beginner's Guide - Master email marketing with these 3 short ebooks from Drip.
The Influencer Marketing Stack - Free resources to launch a killer campaign
Elevatr Email Marketing Automation - Fast and easy email marketing software
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM