Flexibits - Makers of Cardhop, Chatology, and Fantastical.
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.
Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.
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.
Kin - Kin is money for the digital world. It is used to generate value through a shared, decentralized cryptocurrency in a digital ecosystem of apps and their users.
Clearbit - Clearbit provides Business Intelligence APIs