GrowthList - A crowd-sourced list of growth hacks
100 Days of Growth - Proven ways to grow your business fast (eBook)
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
Petit Hacks - Acquisition, retention, & revenue hacks used by companies
Growth Hack World - Together We Rise
Responsible - Strategies to help build trust and retain users early on