1) Open Office.org
-can open, read, & create files that are compatible with MS office 2007
-free, use for any purpose
-use for word processing, spreadsheets, data bases, presentations ect.
openoffice.org

2)Correl Word Perfect x4
-traditional interface for word processing, spreadsheets, & presentations
-prices from around $20.00 (OEM version) up to $300.00
trinitysoftwaredistribution.com

3)Think Free Office
-alternatives to MS Word, Excell, & Power Point
-very close look and feel to office 2007
-cost of around $50.00
product.thinkfree.com/office/