Content Marketing Stack - A curated directory of content marketing resources
growth.email - Weekly curated email with the best growth marketing articles
GrowthHackingIdea.com - One short, curated growth hacking idea a day to your email
Great Email Copy - A dose of emails from around the web.
This Won't Scale by Drift - 40 free marketing playbooks to help you grow your business
Sales & Marketing Stack Wiki - Curated articles about modern sales & marketing technology