Office alternatives:

Open Office: OpenOffice.org 1.0 is the completely free open source office suite based on code for StarOffice 5.2. The package includes word processor, spreadsheet, drawing
program, presentation program, equation writing program and more. A Mac version is planned, but not yet available. (Windows, Linux, Solaris)
Download: http://download.openoffice.org/index.html

602 PC suite: Software602 offers their MS Office compatible office suite for free. You do need to register, but registration is free. (Windows) Alternative to Microsoft® Office compatible with Word/Excel files! The suite is composed of four full-featured applications: a word processor, spreadsheet, graphics editor and digital photo organizer.
Download: http://www.software602.com/download/

Star Office is free for educational purposes ! Pay only for shipping and cost of media !