Ground News Bias Checker - Browser extension which exposes media bias as you browse.
Growth.Design Case Studies - Product tips… in a comic book format
Brainiac - Database of 150 cognitive biases that control our decisions
GoodUI - Collection of clever UX patterns & ideas
Zero to Marketing - Short case studies that help you get better at marketing
Kickstart Side Hustle Newsletter - Dwarf-size newsletter with viral marketing case studies