Here is one tool worth considering:
https://ghidra-sre.org/
Check out the 6 minute video on that page also.
Not in response to the recurring complaints of our (USA) National Security Agency getting into everyone's business...
But here they have gone "Open Source" and released their software tools in a GitHub repository.
Yes Virginia, NSA has gone open source:
https://code.nsa.gov/
(Actually, NSA has been a long time contributor to the Open Source movement, including the Linux project.)
= = = = = Later = = = = =
What could go wrong with Busybox (PW4-5.12.2)?
Not much, that should be fairly solid, if Lab126 hasn't "improved it".
Well, Phooey! That picture came out way too small...
The actual error message is:
The point is that this bit of NSA software is worth looking into, not that Lab126 managed to screw-up their build system using one of the most solid program's in OS existence.
Yeah! Lab126.
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And: Yes! NiLuJe, this program also de-compiles (to C).