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!
GrowthList - A crowd-sourced list of growth hacks
Quokka (formerly Kryptowire) - The gold standard in SAST, MAST, IAST, and more!
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
Growth Hack World - Together We Rise