Ground News Bias Checker - Browser extension which exposes media bias as you browse.
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
Brainiac - Database of 150 cognitive biases that control our decisions
Kickstart Side Hustle Newsletter - Dwarf-size newsletter with viral marketing case studies
GoodUI - Collection of clever UX patterns & ideas
Growth.Design Case Studies - Product tips… in a comic book format