GrowthList - A crowd-sourced list of growth hacks
Q-Stats - Get free marketing insights for every question on Quora.
GrowthHackers Projects - Growth collaboration software for teams 📈
Site Rank Data - View historical rank information of websites via time series charts.
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
Seoxan - check seo report for any website, alexa ranking, server information, meta tags, authority, page speed and more