Salesforce Data.com - Data.com provides company profiles and contact information across millions of businesses worldwide.
BusyContacts - BusyContacts is a contact manager for macOS.
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.
Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.
FullContact - Put the power of full contact information into your web or mobile apps.
Windows Contacts - Windows has many extraordinary organizers, and in the event that you include distributed storage, then you presumably have more.