$0 doesn't get you a ripper with the ease of use and neatly integrated AccurateRip functionality that dBPowerAmp provides. Unfortunately I don't think there are any non-Windows* rippers that use the AccurateRip database, which is a shame because I don't think a decent ripper is complete nowadays without it.

Why would you want a ripper that you can never be sure that any rip could have a pop or a click lurking in it somewhere. With AccurateRip I don't have to worry about that.

I'm also fairly sure that there isn't a free ripper that takes results from four metadata services and combines them.

Sometimes the best software isn't free, thats just life.

* EAC and dBPowerAmp appear to be the only rippers using AccurateRip, though there is a Perl script floating about somewhere as well