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OpenOffice.org
Speaking of word processing, having the ability to read comments and use Track Changes in a Word document is a must for a writer. Fortunately, OpenOffice.org has that — and more — covered. You’ll be able to edit spreadsheets, documents, and PowerPoint presentations without much fuss, and in the case of Word documents, you'll be able to use the Track Changes and comments features. Even some pay alternatives to Microsoft Word don’t offer this kind of functionality.