Audible - Audible is the world’s largest provider of premium audiobooks and spoken word content.

The Creative Marketer - Techniques & tools for copywriters, marketers, and creatives

LibriVox - free public domain audiobooks

Zero to Marketing - Short case studies that help you get better at marketing

Mobilism.org - A home for book lovers, app enthusiasts, and much more.

SwipeWell - The only tool dedicated to helping you save, organize, and reference marketing examples (so you never feel stumped).