Windows Contacts - Windows has many extraordinary organizers, and in the event that you include distributed storage, then you presumably have more.
FullContact Card Reader - Automagically scan biz cards into LinkedIn/Gmail contacts
Apple Contacts App - Access and edit your contacts from personal, business, and other accounts with the Contacts app.
Simple Contacts - Contact lens prescriptions from home
Plan - Plan is a better way to organize.
Contractbook - Helping businesses scale with future-proof contracts