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
Content Marketing Stack - A curated directory of content marketing resources
NEWOLDSTAMP - Email signature generator
StartupResources.io - Tightly curated lists of the best startup tools