Open Source Operating System - Linux

www.linux.org

Linux is a Operating System (OS -Similar to Windows or MAC) is a free open source software and build by the online community. Meaning that anyone with programming experience can work or change their own Linux Operations System functionality. Linux is becoming popular as the basis for computer networks, and is commonly used as the operating basis for Internet servers because it is cheap (how cheap is free?) and reliable.

Open Source Office Suite - Open Office

http://www.openoffice.org

An office-productivity suite which is approximately comparable to MS Office. It was previously known as StarOffice before it became an open-source project. OpenOffice comes with OpenWriter - a word processor, OpenCalc - a spreadsheet and OpenImpress - a presentational package. It is available for many different platforms, including Microsoft Windows, Unix-like systems including Solaris and Linux, and Mac OS X. It is intended to be compatible with, and compete with, Microsoft Office.

Open Source Group Ware - phpGroupWare

http://www.phpgroupware.org

phpGroupWare is a multi-user groupware suite written in PHP. It provides a Web-based calendar, todo-list, addressbook, email, news headlines, and a file manager. The system as a whole supports user preferences, themes, user permissions, multi-language support, an advanced API, and user groups.

Open Source Anti-virus - ClamWin

http://www.clamav.net

MS Windows front-end to Clam Antivirus. Includes scheduler, virus database updates, standalone scanner, context menu integration to MS Windows Explorer and Addin to MS Outlook. Also features easy setup program.

Open Source Project Management - GranttProject

http://www.clamav.net

GanttProject is a project scheduling application written in Java and featuring gantt chart, resource management, calendaring, import/export (MS Project, HTML, PDF, spreadsheets).