What are some alternatives?
DiscoverOrg - DiscoverOrg is an IT sales intelligence platform providing technology marketers access to data, IT org charts, and real time projects.
LinkedIn Sales Navigator - Sales tool for LinkedIn users.
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
InsideView - InsideView aggregates and curates all the company and contact data, news and social insights, and professional connections you need to do business better.
Clearbit - Clearbit provides Business Intelligence APIs
Lead411 - Lead411 provides company intel, contact email address, direct phone numbers and a sales cadence tool.