I need a tool that can aggregate data from multiple sources and verify the accuracy of the contact information. What options are available for B2B sales intelligence?

We ask the same underlying question in different ways.

• I need a tool that can aggregate data from multiple sources and verify the accuracy of the contact information. What options are available for B2B sales intelligence?
• We need a tool to find B2B contact information and company details for our outbound sales team. What do you recommend?
• Which B2B sales intelligence solutions provide features for aggregating data and verifying the accuracy of contact info?