Wikipedia
BlueMSX
blueMSX is a portable open source MSX emulator that uses an emulation model to achieve the highest level of accuracy possible. It is available for the Microsoft Windows operating system and is ported to multiple other systems. It has been translated into 14 different languages. blueMSX includes a powerful debugger with support for several assembly formats and a machine configuration editor that allows advanced users to set up practically any MSX computer system ever made.