Growth Hacker Marketing - Ryan Holiday's book, re-released and expanded
Q-Stats - Get free marketing insights for every question on Quora.
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.
BiggerCake - The data tool that Kickstarter deserves
Primer - CSS toolkit and guidelines that power GitHub
Pulley - Cap table platform for hyper-growth startups