ActivePrime - ActivePrime platforms provide data enrichment solutions for CRM systems.
Google Contacts - Google Contacts is Google's contact management tool that is available in its free email service Gmail, as a standalone service, and as a part of Google's business-oriented suite of web apps Google Apps.
Salesforce Data.com - Data.com provides company profiles and contact information across millions of businesses worldwide.
Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.
Lead Peep - Thousands of b2b leads in the palm of your hands, instantly.
Windows Contacts - Windows has many extraordinary organizers, and in the event that you include distributed storage, then you presumably have more.