SaaS 1000 - Free exportable list of the fastest growing SaaS companies
Mattermark - Ranking 800,000+ high growth Internet companies
Breakout List - A list of the fastest growing startups
Look at that SaaS - Inspiration and resources for SaaS founders
Crunchbase - Crunchbase is a platform for discovering industry trends, investments, and news about companies around the world.
Close - A CRM with built-in calling, SMS, and email