Do you know a free (as in freedom) CCleaner equivalent which works on Mac OS X Mavericks?
I've searched but found nothing.
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If you are going to re-partition to install another O/S then a cleaner won't do much, it really depends on how much room you need to recover for your partition.
That said there are a number of cleaners out there. I have always used the free Onyx. I usually get it off of MacUpdate. Note that the latest version is always for the latest O/S if you don't have Mavericks look on the developer's website for earlier versions.
Oddly enough CCCleaner is available for the Mac, and while I have used the PC version quite a bit I have never used it on the Mac, preferring to stick with the utility I know. So I can't speak to how good a job CCCleaner does on the Mac.
MacUpdate is a great place to look for software, pretty much everything you are looking for here can be found there.