Clearbit - Clearbit provides Business Intelligence APIs
DiscoverOrg - DiscoverOrg is an IT sales intelligence platform providing technology marketers access to data, IT org charts, and real time projects.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
Datanyze - The sales prospecting tool powered by technology data
Owler - Owler is a crowdsourced data model allowing users to follow, track, and research companies.
LinkedIn Sales Navigator - Sales tool for LinkedIn users.