ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
6sense - 6sense is a B2B predictive intelligence engine for marketing and sales.
Clearbit - Clearbit provides Business Intelligence APIs
Leadiro - Seriously Smart & Live B2B Data
LinkedIn Sales Navigator - Sales tool for LinkedIn users.
DiscoverOrg - DiscoverOrg is an IT sales intelligence platform providing technology marketers access to data, IT org charts, and real time projects.