This plugin takes the size of the fifth (in cents) as input and then retunes the score based on the circle of fifths. Results "make sense" for western notation between ~686 and 720 cents. The GUI gives you some common equal tunings you might want to try, like 7, 19, 31, 17, 22, and 5.
It's a modified version of the 19 TET plugin:
Which was a modified version of the 31 TET plugin:
With nothing selected, it tunes the whole score. With something selected, it tunes what's selected.