Just a reminder that providing specifics on, sharing links to, or naming websites where ROMs can be accessed is against the rules. If your post has any of this information it will be removed.
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Any tool that has cross platform somewhere in it's description can be used on a Mac. Check the Tools, Tutorials & Resources section and try some keyword searches.
Many tools designed for Windows can be used on Mac. Here's a link to the Wine project's FAQ. It's very advanced software, but it's near necessary if you are not using a PC. There's instructions on how to install on Apple at 2.10.