PHP iAddressBook is an address book for a single user. You can use it for Personal or Business Cards (it supports tons of fields), features a spotlight-like search, has transparent vCard import/export, multilanguage support, design templates and an intuitive interface. It aims at 100% compatibility to the AddressBook in Mac OS X.
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At one point, Open Hub analyzed source code for this project based on code location(s) available at that time. Since then, the code locations have been removed.