SaaS Email Marketing Handbook - Double Your MRR With Email Marketing
Growth Hacker Marketing - Ryan Holiday's book, re-released and expanded
Elevatr Email Marketing Automation - Fast and easy email marketing software
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.
HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
Ryan Holiday - We Invest $500k in Sci-Fi Founders.