Salesforce Data.com - Data.com provides company profiles and contact information across millions of businesses worldwide.
Hunter - Find all the email addresses related to a domain
Demografy - Demografy is a SaaS platform that uses AI to predict customer demographics from names. It provides full coverage, accuracy estimate before purchase and work with even masked names enabling privacy and GDPR-compliance.
Mail Dump - Powerful Extensions for email addresses extracting, verifying and finding
FullContact - Put the power of full contact information into your web or mobile apps.
Snov.io - More leads. More sales. More revenue.