HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
WiseStamp - WiseStamp allows you to easily create and implement slick and unique email signatures for your business.
Email Marketing: A Beginner's Guide - Master email marketing with these 3 short ebooks from Drip.
NEWOLDSTAMP - Email signature generator
Elevatr Email Marketing Automation - Fast and easy email marketing software
Sigstr - Email signature marketing