Zoho.com,
ThinkFree.com,
Ajax13.com
All three of these websites want to help you be more productive anytime you're online, from any browser—not just when you're sitting at your home or work PC. Each offers its own suite of free, Web-based tools that mimic Microsoft Office programs such as Word, Excel and Power Point. These Office alternatives are also compatible with their Microsoft counterparts, so you can import work from—or export it back to—the mother suite. Another advantage to using a Web-based spreadsheet or word processing app is that you can make your documents available to others to view or edit. Google is also going for a piece of this action with its Docs & Spreadsheets.