Growth Hacker Marketing - Ryan Holiday's book, re-released and expanded
Analytics Pack - A curated directory of the best startup metrics
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.
Baremetrics Benchmarks - Benchmark your SaaS metrics with other startups
Primer - CSS toolkit and guidelines that power GitHub
Open Benchmarks - Live SaaS metric benchmarks from over 600 companies