Open Office

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Here's a neat freebie that's not specifically for teachers but something that students and teachers can use to work. From the website: OpenOffice.org 3 is the leading open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more. It is available in many languages and works on all common computers. It stores all your data in an international open standard format and can also read and write files from other common office software packages. It can be downloaded and used completely free of charge for any purpose.
This software from Sun Microsystems can be downloaded by students at home if they don't already have the commercial product on their computer. A great tool!

Website: http://www.openoffice.org/