Abiword 3.0.1

AbiWord is a replacement for MS Word. It is lightweight (meaning it runs quickly) and includes every feature used regularly in a word processor. It can save files in formats that you can exchange with Word and WordPerfect, plus open any of their files, as well.

http://www.abisource.com/

OpenOffice 4.1.1

OpenOffice includes effective replacements for Word, Excel, PowerPoint, and workable replacements for Access and other Office elements. It supports file formats for multiple office suites in every element.

http://www.openoffice.org/