BrMSX
The fastest MSX emulator, written entirely in assembly, because that's how I roll. It was also the most accurate emulator at its time, but it has since been surpassed by openMSX. A number of features which now are common in MSX emulators were first seen here, such as dir as disk, save states and integrated debugger.
Download: brmsx206.zip
Source: github
Web: BrMSX at wikipedia