GrowthHackingIdea.com - One short, curated growth hacking idea a day to your email
Growth Hacker Marketing - Ryan Holiday's book, re-released and expanded
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
Your Growth Hacks Aren't Working - Free new book by Steli Efti on B2B customer acquisition
Weavr Cafe - Weavr is a platform to build active learning communities.
Spacedoo - Short actionable marketing hacks