Thunderbird is a total redesign of the Mozilla mail component to produce a cross-platform, stand-alone mail application using the XUL user interface language. It has many new features, among them the ability to customize your toolbars the way you want them. a new look and feel with a large number of downloadable themes which alter the appearance of the client, and the ability to add UI extensions.
The PortalSys Addressbook is designed for clients who use Outlook on the desktop but use Linux as the mail system. It allows you to easily integrate Outlook with your Linux system's addresses. The system is made up of two parts: an Outlook service for your Win32 clients and a server-side application to generate and update your addressbook as often as you like.
R-AddressBook is a Java address book which stores its data in XML format. It can be run on virtually any computer (including PDAs) and offers local and global address information storage, WebServices based synchronization, off- and on-line operation, no restriction on the type or number of fields for each entry, and automatic address updates.
Moyobase is a Web application designed to manage all your data and information in one place. Its powerful customizable features allow you to structure data and quickly access important information. Colleagues and partners can add notes on a customer page so that the information is instantly shared among everyone involved. Moyobase keeps track of things to do and manages your tasks with due dates, priorities, and notes. You can also assign tasks to others. Moyobase can plot charts with any piece of information stored in your database.