OpenOffice.org is a mature, open source, front office applications suite with the advantage of a saved file format based on an open XML DTD. This gives users and developers an extraordinary amount of flexibility and power in dealing with work produced in
OpenOffice works well with the Mac, the PC, Linux, and so on. It works so well with Microsoft Office that you can easily share documents with folks that don't use OpenOffice; no hassles at all. Fully-featured, versatile, powerful Office Suite.
This site provides comprehensive, web based training for OpenOffice. These OpenOffice tutorials will teach you everything you need to know to become an OpenOffice guru in just an hour or two.