JWASM
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JWASM is an x86 assembler that targets 16, 32 and 64 bit platforms. It is designed as a free MASM-compatible assembler and is made available under the Sybase Open Watcom Public License. It can produce binaries for the DOS, Windows, Linux, OS/2 and FreeBSD operating systems. JWASM is an almost complete rewrite of the original Watcom assembler WASM. JWasm is written in C. The source is portable and has successfully been tested with Open Watcom, MS VC, GCC and more. The author is Japheth at the external link below.