Nawvel - Nawvel is a handy-dandy library of tried, tested & curated resources.
Content Marketing Stack - A curated directory of content marketing resources
Startup Network - Predicting successful startups using AngelList data
The Influencer Marketing Stack - Free resources to launch a killer campaign
Google Design Sprint Starter Kit - This Kit helps you to run your first Google Design Sprint.
Marketing Examples - A gallery of real world marketing case studies. Updated every day.