Growth Hacker Marketing - Ryan Holiday's book, re-released and expanded
Phey - Keep an eye on your (Upcoming) Product's subscribers/votes 📈
Your Growth Hacks Aren't Working - Free new book by Steli Efti on B2B customer acquisition
Viable Fit - Measure and improve your product market fit
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
Product Market Fit Toolkit - Measure your product-market fit using data you already have