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.
ABBYY Business Card Reader - Scan cards ≡ in a second and manage them everywhere ☁
Free Address Book - In our contact management software you can store fast and easily name, phone numbers, birthdays, address, company name, city, mobile numbers, insurance and loan info, e-mail addresses.
Sansan - Sansan provides a internal contact sharing service for companies.
Clearbit - Clearbit provides Business Intelligence APIs
Haystack - Your new business card.