NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Salesforce Data.com - Data.com provides company profiles and contact information across millions of businesses worldwide.
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
MailGet Enricher - MailGet Enricher is a lead enrichment software which transforms any email address into complete person’s profile.
DeBounce - Email Validation, Email Checker, Data Enrichment and Appending Tool. Using DeBounce remove invalid, disposable, spam-trap, syntax and deactivated emails.
ActivePrime - ActivePrime platforms provide data enrichment solutions for CRM systems.