SugarCRM
This customer relationship management package is one of the few examples of a classic enterprise application built on an open source basis. http://www.sugarcrm.com
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OpenOffice.org
If you're considering weaning your organization, or some subset of it, off Windows or just off Microsoft Office, your people will need some other way to write letters and run the numbers. The OpenOffice application suite has steadily improved its word processor, spreadsheet, and other applications, and can read and write Microsoft Office file formats. http://www.openoffice.org
Firefox
Backed by Mozilla, one of the best organized open source organizations, Firefox salvaged what was left of the Netscape brand and created a new, standards-compliant browser that's a perfectly viable alternative to Internet Explorer. http://www.mozilla.org
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Thunderbird
A sister project to Firefox, Thunderbird is the Mozilla project's mail client. Not exactly an Outlook replacement (doesn't include the other Outlook features such as calendaring) but a capable, standards-compliant e-mail program. http://www.mozilla.org/thunderbird
Evolution
Email, groupware, and personal information manger created as part of the Gnome Project and backed by Novell. Can connect to Microsoft Exchange servers, making it a potential replacement for Microsoft Outlook on Linux. http://www.gnome.org/projects/evolution/