ConTagged
ConTagged is a web-based address book for small companies written in PHP.
6 Alternatives To ConTagged
Apple Contacts App
Access and edit your contacts from personal, business, and other accounts with the Contacts app.
FCorp ID Book
ID Book is a handy, easy to use application specially designed to offer users a simple address book.
Kontact
Kontact is the integrated Personal Information Manager of KDE.
Kontact - KAddressBook
KAddressBook stores all the personal details of your family, friends and other contacts.
Windows Contacts
Windows has many extraordinary organizers, and in the event that you include distributed storage, then you presumably have more.