GrowthList - A crowd-sourced list of growth hacks
100 Days of Growth - Proven ways to grow your business fast (eBook)
GrowthHackers Projects - Growth collaboration software for teams 📈
Petit Hacks - Acquisition, retention, & revenue hacks used by companies
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
Responsible - Strategies to help build trust and retain users early on