upx

UPX is a compressor for several different executable formats.
Programs receive a stub that makes them self-runnable. When run,
decompression either happens in memory in-place if possible, or to a
temporary file, the latter of which does not support setuid programs,
or the proper name in argv[0].

          

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License: GPL-2.0-or-later AND Apache-2.0 WITH LLVM-exception AND BSD-4-clause AND BSD-3-Clause AND MIT AND Zlib AND (LGPL-2.1-only OR CPL-1.0)
URL: https://upx.github.io/