The Netwide Assembler, NASM, is an 80x86 assembler designed for
portability and modularity. It supports a range of object file
formats, including Linux a.out and ELF, NetBSD/FreeBSD, COFF,
Microsoft 16-bit OBJ and Win32. It will also output plain binary
files. Its syntax is designed to be simple and easy to understand,
similar to Intel's but less complex.

This is the development version.