NASM is an 80x86 assembler designed for portability and modularity. It supports a range of object file formats including Linux a.out and ELF, 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. It supports Pentium, P6, MMX, 3DNow! and SSE opcodes, and has macro capability. It includes a disassembler as well. License: GNU Lesser General Public License (LGPL) Changes: This release adds x86-64 support, instruction support for all public instruction set extensions up to and including SSE5, as well as support for the ELF64, COFF64 (Win64), and Mac OS X file formats. A number of bugs have been fixed, and the performance significantly improved.

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