Open Office - .doc, .docx, .odt, .ods, .odp, .ppt, .pptx, .xls, .xlsx

Open Office Download OpenOffice to use as a free Office Suite. OpenOffice will open most Microsoft Office documents. In addition it is a complete Office suite with a word processor, presentation and spreadsheet software. Documents created with OpenOffice can be saved as Microsoft Office documents. 

http://www.openoffice.org/download/

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