Libre Office is a complete productivity suite (similar to MS Office and OpenOffice) that includes a word processor, spreadsheet application, presentation tool, database and diagram designer. The program can open or import most common Microsoft Office formats, including .doc, .ppt and .csv as well as a variety of other document formats. The files you create can be saved in Open Document Format as well as MS Office formats and other document types.Libre Office offers just about anything you would expect from a full featured productivity suite, and if you don't have MS Office or are looking for a free, open source replacement, you should definitely give this one a try.