OpenOffice.org
 
Advantages Free, Open Source, complete and powerful office suite, with a very good reputation.
Advantages Available on several operating systems: GNU/Linux, Unix, MacOS X, Windows.
Advantages Capable of reading and writing files from Microsoft Word and Excel. The compatibility level seems to be very good.
Advantages HTML page editor, which generates clean HTML code.
Advantages Lots of original cliparts and impressive 3D effects.
Advantages As the tool is free software, I can use the same tool at work and at home, and you will be able to use your documents any time in the future!
Advantages It is supported by the Open Source community and Sun Microsystems.
Advantages Saves documents in compact files.
Drawbacks There are sometimes font conversion problems when opening files in Microsoft proprietary formats. Documents are still readable, but sometimes don't look as good as the original ones.

See also