DiscoverOrg - DiscoverOrg is an IT sales intelligence platform providing technology marketers access to data, IT org charts, and real time projects.
Norbert - Norbert is an online tool that helps you to find anyone’s corporate email address.
Clearbit - Clearbit provides Business Intelligence APIs
Hunter - Find all the email addresses related to a domain
LinkedIn Sales Navigator - Sales tool for LinkedIn users.
LeadIQ - VP of Sales. Every second in sales counts. You hired your sales team to sell, not do data entry. LeadIQ will pump up your sales team with accurate prospect data and a smooth workflow so you can fill up your pipeline faster.