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by MrDOS 28 days ago
Ken Silverman (of Build Engine fame) has written a few deflate-centric compression utilities[0]. The PNGOUT recompressor is the most famous of these (and is very good – it practically always beats OptiPNG), but the suite also includes a .zip archive recompressor called KZIP. I'd be curious to see how ZIP Shrinker compares to this tool.

[0]: https://advsys.net/ken/utils.htm