OpenOffice is possibly one among the finest examples on what can be achieved in the world of Free Software. For starters, OpenOffice is an office application suite in the lines of Microsoft Office and is available for Windows, Mac and Linux. The latest stable release is OpenOffice 3.1. You may want to know how to install OpenOffice 3.1 in Ubuntu. Now let us take a look at the list of extensions you could use in OpenOffice.