SASM

SASM (short for SimpleASM) is a free and open source cross-platform integrated development environment for the NASM, MASM, GAS and FASM assembly languages. It features syntax highlighting and includes a debugger.SASM is intended to allow users to easily develop and run programs written in assembly language. It was written by Dmitriy “Dman95” Manushin and licensed under the GNU GPL v3.0. It is written in C++ and uses the multi-platform Qt toolkit.