SwipeWell - The only tool dedicated to helping you save, organize, and reference marketing examples (so you never feel stumped).
Startup Stash - A curated directory of 400 resources & tools for startups
AppGrowthLab (by SplitMetrics) - 55 app growth lessons from 30 app marketing experts
Startup Buffer - Startup Buffer is a premium startup directory for emerging startups all around the world.
Growth Tower App Analysis - Top 500 US iOS apps & ASO analysis
Makerbook - A directory of the best free resources for creatives