Apple's office suite iWork costs $19.99 per app (Pages, Numbers, and Keynote) on the Mac, but if you bought an OS X computer after September 2013, Apple will save you the $60 and give you the apps for free. On an older Mac? There's a workaround to download all three iWorks apps for free.
Not only do you get the full and latest versions of iWork, they'll be associated with your Apple ID and available to any other Macs you have.
I tried this the last night and it worked like a charm, but you have to first make sure you've got the latest version of OS X Yosemite installed, or else you'll probably get error messages. Since Apple probably didn't intend for this 5 year old trial to work this way, you might also want to do this as soon as possible, should the loophole get fixed.