Mac OS X: Microsoft Office for Mac 2011 has been around for a little while, but now you can try it free for 30 days if you want to give it a test run before making the $169+ investment. A similar option already exists for Windows users. [Microsoft ]
Microsoft Offers Free 30-Day Trial On Office For Mac 2011

A similar option without the time limit exists on BitTorrent?
It’s not similar in a legal sense, of course.
Add OneNote and they will come…
OpenOffice have a similar deal I believe, except their offer is free to try forever. 😉
Or switch to Libre Office instead.