Growth Hacker Marketing - Ryan Holiday's book, re-released and expanded
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
Global Content Marketing - A how-to book to scale your content marketing across regions
Spacedoo - Short actionable marketing hacks
Waitlisted - Waitlisted helps new brands and startups build an audience while they focus on building a product
Oso - A batteries-included system for authorization.