SwipeWell - The only tool dedicated to helping you save, organize, and reference marketing examples (so you never feel stumped).
Edupops - Learn startup and marketing skills with 1-minute videos
AppGrowthLab (by SplitMetrics) - 55 app growth lessons from 30 app marketing experts
Laudspeaker - Open source cross channel marketing and messaging platform
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
Growth Marketing Checklists - Checklists to help optimise your marketing efforts