GMass - GMass allows you to easily schedule emails, send out mass emails and mail merge campaigns and more with Gmail! Click here to learn about more features!
Zero to Marketing - Short case studies that help you get better at marketing
Quokka (formerly Kryptowire) - The gold standard in SAST, MAST, IAST, and more!
Marketing Resources List - The biggest collection of free marketing resources
HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
SaaS Marketing Essentials - Guide to Launching & Growing Your SaaS Application