Precomp, C++ version - further compress already compressed files
An example of such tool is precomp - this one is unlikely to be used by FitGirl though, it's just a tool that I know of : http://schnaader.info/precomp.php
NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.
How can I perfectly recreate a PNG losslessly compressed to JXL?
1 project | reddit.com/r/jpegxl | 10 Feb 2022
Help me out with some compression tips
2 projects | reddit.com/r/compression | 6 Jan 2021
Is there any research as to what's the best way to compress each file type?
4 projects | reddit.com/r/compression | 14 May 2022
Attempting to re-create / replicate an archive made years ago with an unknown application, which is no longer complete on a file-sharing network
4 projects | reddit.com/r/compression | 11 Nov 2021
TSXor: A Simple Time Series Compression Algorithm
1 project | news.ycombinator.com | 14 Sep 2021