GPLDL - 1066 GPL-licensed WordPress themes & plugins for free
Content Marketing Stack - A curated directory of content marketing resources
Blocksy - A lightningfast, innovative and supercharged WordPress theme
GrowthHackingIdea.com - One short, curated growth hacking idea a day to your email
LyrWP - WordPress themes / plugins / services curated.
This Won't Scale by Drift - 40 free marketing playbooks to help you grow your business