GrowthList - A crowd-sourced list of growth hacks
Growth Hacker Marketing - Ryan Holiday's book, re-released and expanded
GrowthHackers Projects - Growth collaboration software for teams 📈
TweetFavy - The Growth Hacking Tool for Twitter. Marketing automation software / Growth Hacking tool designed to grow your social media influence and attract real, targeted and engaged Twitter followers.
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
Primer - CSS toolkit and guidelines that power GitHub