HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
Epichat for Messenger - Raise your social media marketing to the next level
Email Marketing: A Beginner's Guide - Master email marketing with these 3 short ebooks from Drip.
ZoConvert - Get started with FB messenger marketing in mins
Email Marketing Academy from MailerLite - Learning platform for email marketing expert certification
Upcado - Super easy to use Messenger Marketing tool for your business