If you link your spreadsheets to external data on a server, neither OpenOffice nor SoftMaker can handle that chore. Although I didn't test it, Zoho apparently does. And while OpenOffice and SoftMaker are quite similar to Office, some of the pull-down menus across the top are a bit different and some of the functions have different names. In sum, there is a learning curve, Zoho's being the steepest.
If you use an iPhone, you won't be able to synch contacts and calendars without Outlook. If there's a work around, I'd love to hear about it. Users of the new Nexus One phone, powered by Google's Android operating system, can synch their contacts and calendars with Google apps and probably Zoho's apps, since these two suites are quite compatible.
Open Source Option OpenOffice is a descendant of a program developed by Sun Microsystems called Star Office. It's now open source, which means that users can actually get into the code that runs behind the scenes and change it. That's probably something you won't do, but it does mean that the program benefits from enhancements made by a large community of software-savvy users.
The main components of the OpenOffice.org Suite are the Writer word processor; the Calc spreadsheet; Impress for presentations; Draw for graphics and the Base database. For now, it is not compatible with Windows 7, though that may well change in 2010. Best of all, it is absolutely free and available to download on as many PCs or Macs as you like.
SoftMaker Office includes a word processor, spreadsheet and presentation programs. But it's so small it can be downloaded and run from a USB drive. The newest version costs $79.95 for up to three users. And here's one benefit of dealing with a small company: you can actually negotiate the price for additional user licenses. SoftMaker is compatible with Windows 7. Older versions are free and still available to download.
Zoho: Hit the Cloud Zoho's office suite includes the usual word processor, spreadsheet and presentation applications, plus an online organizer (a bit like Outlook, without the e-mail function) and "notebook," which allows you to collect bits and pieces of Web content in one place without leaving your browser. But Zoho's claim to fame is that all of these applications (plus another dozen business and collaboration programs the company offers) run on the Web, within your browser.
That means you sign in to Zoho, and then pick the application you need to run. The look is noticeably different than the familiar File, Edit, View etc. menus on the Office screen. Even more radical is the fact that your documents are stored online on a Zoho server. You can save versions to your hard drive and read or edit them when you are offline, but many of the most resource-intensive functions (spell check, for example) are only available online. That's a downside of course.