masm compatible assembler.
Runs under Windows, Linux, DOS, OS/2 ( and probably other OSes as well ).
Hints:
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For Windows, use file Msvc.mak/Msvc64.mak if Visual C++ is to be used to create a 32-/64-bit version of JWasm. OWWin32.mak will create a 32-bit binary using Open Watcom.
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For Linux, use GccUnix.mak to produce JWasm with gcc or CLUnix.mak to use CLang instead.
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For DOS, Open Watcom may be the best choice. It even allows to create a 16-bit (limited) version of JWasm that runs on a 8088 cpu. Old versions of Visual C++ are also possible, although you probably need the HX development files then.
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For OS/2, OWOS2.mak (Open Watcom) is supplied.
There is a bunch of other makefiles in the main directory, intended for other compilers. Some of them might be a bit outdated.