Windows Contacts - Windows has many extraordinary organizers, and in the event that you include distributed storage, then you presumably have more.

Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.

Flexibits - Makers of Cardhop, Chatology, and Fantastical.

Open Contacts - Open Contacts is an advanced address book program for managing contact info of individuals and...

tinyblu - Never neglect your friends again. See how long it's been since you last hung out.

Plan - Plan is a better way to organize.