Are There Any EQ Plugins for Audacity?

I don't use Audacity much as it's not my preferred audio editor, but yeah, Audacity's VST Enabler definitely leaves much to be desired. From what I recall it does not typically display a VST plug-in's GUI. It only displays the plain text and sliders, etc. But regardless it should still work (at least most of the time, lol).

Did you read the manual that comes with Spitfish? If you don't have it set up right you probably won't notice any improvement in the sound. Also I'm assuming that you know that you have to select a section of audio in Audacity first before you can apply any effects to it (Edit > Select All).

Anyways, if you can't get Spitfish to work then the next best option would be to use a parametric EQ. But they're a bit more complicated than a graphic EQ, so if you don't know what you're doing then you might be better off just using a graphic EQ (ie Classic EQ). As I mentioned earlier that's not the best option for reducing sibilance as it will remove some desired frequencies as well, but it will at least take some of the "edge" off of the sibilance.

But Brians right - the best way to prevent this is to use better hardware and/or technique to get a better recording in the first place. It's always harder to have to "fix it in the mix".