Agreed on the Bootsy/Variety of Sound tools.
Baxter EQ is built around baxandall filters, so is perfectly suited for buss use.
Thrillseeker LA is also very good for that analogue colouration as well, but not totally convined as to it'ssuitability for mastering simply because it does add that colouration whereas what is ideally needed in mastering is a clean tool, as presumably the mix being mastered has been approved by the client already and after all, mastering is supposed to be all about preparing a mix for it's intended release media and not slapping your own "sound" onto it....
Basically, unless we are talking personal stuff, you're going to have to pay for good mastering tools.
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