Tech Soup is running an in depth comparative review of the open source and free Open Office compared to Microsoft Office. See also the Mac version of Open Office, NeoOffice. I’m going to be interviewing a man from Open Office as soon as I can get myself together enough to make it happen. It’ll be in the Net Squared interviews section. Did you know that Open Office has an estimated 40 million users and 60 language projects underway?
Maybe it’s naughty and I ought to just forge headfirst into the open source world, but I feel like I need compatibility with Microsoft format every once in awhile at least. In that spirit I’m going to check out ThinkFree Office Online. See also AJAXwrite (thanks Noka for pointing that one out).