Re:We analyzed 425k favicons
by jamesfinlayson on Wednesday October 20, 2021 @07:58PM
(#28938484)
I found https://pngquant.org/ to be pretty good.
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| on HN ]
Note that unlike some of the other tools mentioned here, pngquant does lossy compression. Might still be the right tool in many cases, but it means you should check the output while e.g. optipng is a no-brainer to add to whatever your publishing pipeline is.