Clearbit - Clearbit provides Business Intelligence APIs
Crunchbase - Crunchbase is a platform for discovering industry trends, investments, and news about companies around the world.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
CB Insights - CB Insights is a company database for the venture capital and corporate development community.
LinkedIn Sales Navigator - Sales tool for LinkedIn users.
Owler - Owler is a crowdsourced data model allowing users to follow, track, and research companies.