XO Wave. Its a freeware editing application. You can update to the Pro version if you want. I played around with the application for a while but I'm not really interested in anything other than GB. You might like it if your interested in another editing/mastering program. I'm not.
Below is a description from the website
http://www.xowave.com/
XO Wave is a digital audio software package complete with everything you need to get music from instruments to CD. XO Wave lets you record, edit, sync to video, mix and burn -- all in one package. With support for Mac OS X and Linux, you'll be recording, burning and podcasting in no time!
Red Book CD Burning
CD Burning is easy: just import audio, mark your tracks, and burn your red book compliant master, along with CD Text, ISRC and MCN/UPC info. Not only that, but any session can be burned to CD in just a few clicks -- great for checking out mixes in the car!
GB2 Forum link for more free stuff
http://discussions.apple.com/thread.jspa?threadID=378467&tstart=