Zero to Marketing - Short case studies that help you get better at marketing
Curatedseotools.com - Curated directory of the best SEO tools.
Marketing Miner - SEO tool for data-driven marketers
KatLinks.io - Rank Higher and Get More Traffic with an affordable SEO Tool
FandangoSEO - Monitor your SEO 24/7 with our SEO Crawler and Log Analyzer
AppGrowthLab (by SplitMetrics) - 55 app growth lessons from 30 app marketing experts