Product School - The global leader in product management training
SwipeWell - The only tool dedicated to helping you save, organize, and reference marketing examples (so you never feel stumped).
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AppGrowthLab (by SplitMetrics) - 55 app growth lessons from 30 app marketing experts
shipit - shipit is a product roadmap and product planning tool that comes with an integrated, battle-proven approach to planning product.
Marketing Examples - A gallery of real world marketing case studies. Updated every day.