Growth Hacker Marketing - Ryan Holiday's book, re-released and expanded
Hypefury - No idea what to share on Twitter?
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.
What to Tweet - Never again run out of Tweet ideas.
Primer - CSS toolkit and guidelines that power GitHub
Toolset.com - The complete and reliable plugin for managing content types in WordPress.