LinkedIn Sales Navigator for Gmail - Rich contact profiles inside Gmail
DiscoverOrg - DiscoverOrg is an IT sales intelligence platform providing technology marketers access to data, IT org charts, and real time projects.
Clearbit for Salesforce – Lite - Rich data on every record in Salesforce for free!
Clearbit - Clearbit provides Business Intelligence APIs
LinkedIn Sales Navigator - Sales tool for LinkedIn users.
RocketReach - RocketReach allows you to lookup email and phone for 250+ million professionals.