Growth Hack World - Together We Rise
SwipeWell - The only tool dedicated to helping you save, organize, and reference marketing examples (so you never feel stumped).
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
AppGrowthLab (by SplitMetrics) - 55 app growth lessons from 30 app marketing experts
Grow my SaaS - Database of 150+ growth and conversion strategies
Marketing Examples - A gallery of real world marketing case studies. Updated every day.