If you're looking for a free office suite of resources such as word processor, spreadsheet, presentation software, database and more, you might want to take a look at LibreOffice 4. It's entirely free, and is a well known and robust package. I've not tried it myself though, so I can't vouch for it personally, but it looks really interesting. If you've got any experience of it - let me know via comments!
ShowDocument. Upload, view and share documents, web pages and images stored on your workstation or server. Exchange ideas and information with colleagues via a real-time interactive whiteboard. Communicate and collaborate with team members by simultaneously writing and editing text. Review, analyse and annotate web pages concurrently by utilizing a shared browser.
FlySuite is a combined package which acts as word processor and spreadsheet. From the site -
With FlySuite applications, you create or open full-featured Word documents & Excel spreadsheets
(Microsoft format). You can share your online documents or send offline copies to the people you want to work with.
Your collaborators don't need any software to view or edit your work, because FlySuite is automatically and freely launched when they open your files. You can be alerted in real-time when a collaborator opens your document and start a conference chat
Ajax13 is a web-based word processor that can read and write Microsoft Word
and other standard document formats. Anytime you need to open, read or
write a word processor file, simply point your Firefox browser to
www.ajaxwrite.com and in seconds a full-featured program will be
available for you to open, edit, print and save.
ajaxWrite has been designed to look like Microsoft Word, making it easy
for anyone to start using it without needing to learn a new program.
ajaxWrite also handles all the popular document formats so it's easy to
share your files and collaborate with your co-workers and friends. Once
finished with your document, you can easily save your work right to
your hard drive. This keeps you organized and works in the same way
that you're already accustomed to.
ajaxWrite works from a Firefox web browser on any operating system and
on any device, no matter where you are or what computer you're using.
And because the application itself lives on the web, thry handle the
updates automatically so that you don't have to deal with costly
upgrades or getting stuck with old versions. However, if you use IE this isn't going to work for you.