Mattermark - Ranking 800,000+ high growth Internet companies
ShareIt by SocialPilot - Free Content Curation and Influencer Discovery Tool
Breakout List - A list of the fastest growing startups
The Content Odyssey Newsletter - Every other week I discuss one B2B content experiment
Crunchbase - Crunchbase is a platform for discovering industry trends, investments, and news about companies around the world.
INDX - INDX is a focused place for self-directed learning.