This document compares and summarizes three free and open source office suites: Apache OpenOffice, LibreOffice, and KingstonSoft Free Office. It provides overviews of the word processing, spreadsheet, and presentation applications included in each suite. Key details include that Apache OpenOffice and LibreOffice are very similar but LibreOffice has slightly better compatibility with Microsoft Office. KingstonSoft Free Office is a full-featured alternative that is available for Windows and Linux and has good compatibility compared to other free options.