Spacedoo - Short actionable marketing hacks
Clearbit - Clearbit provides Business Intelligence APIs
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.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
Ryan Holiday - We Invest $500k in Sci-Fi Founders.
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.