ContextLookup is a Blackberry app that adds a "Lookup Contact" menu item to the e-mail view screen. You can choose any address field from the email and look it up in the corporate address book, provided your Blackberry is connected.
evolution-kolab is a plugin for the Evolution PIM suite to connect to a Kolab groupware server. It lets you use Evolution as a client for Kolab and share appointments, contacts, email messages, and more with other members of your Kolab site.
cardme is a Java library implementation of RFC 2426, VCard. It provides Java applications with a way to read and write from and to the VCard file format. The project's goals are to provide a flexible and easy to use library with excellent documentation.