Office
Abiword
AbiWord is a free word processing program similar to Microsoft Word. It is simple and easy to use and is suitable for a wide variety of word processing tasks. It can also save text files in a variety of common formats (including .doc)
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For more information and to download it, you can check its Website.
Open Office
OpenOffice is the leading open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more. More and more people are using Open Office in place of expensive, proprietary office solutions like Microsoft Office. Open Office can even save and open files in Microsoft Office Formats (.doc, etc.)
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For more information and to download it, you can check its Website.