A new version of PDF Index Generator, which is the best automatic back-of-the-book index maker. 3.3 (May 2023) has… “fixed footnotes, as it was showing footnote number & normal page number too!” Kind of a useful fix, at least for footnote fiends!
A little expensive at $70, but it’s a one-time perpetual licence and last Black Friday there was a BF30 “30% off” coupon code.