Open office is the open source (free) alternative to the ubiquitous but quite expensive Microsoft Office. One of the lynch pins of the growing opensource movement, it provides you with all the normal desktop (word processing, spreadsheet, etc) applications that you would expect, but at no cost.
On the downside some of the fancier integations of Microsoft's offering are not available to the user of Open Office, but for those looking for extensive integrations, Add-Ins,
Channel Computing Newsfeed
