Calypso: Freeware emulator for DOS.
DumpMasters: Offers a large download section.
Emukon: A freeware emulator for Windows.
Massacre Homepage: Contains many different versions of this Emulator.
Massage: Freeware emulator for DOS.
MasterGear: Commercial emulator for Win32 and freeware emulator for FreeBSD, Linux, MacOS, OS/2, OSF/1, Solaris, SunOS and WinCE.
MesaDX: A freeware emulator for Windows.
Osmose: Open source emulator for Linux and Windows.
Past-O-Rama: Freeware emulator for Win32.
Saya RX-SMS: A freeware emulator for Windows.
Semus: An open source emulator for Windows.
SMaSher: A freeware emulator for Windows.
SMS Plus: Open source emulator for DOS. Ports are available for Acorn, BeOS, Dreamcast, GamePark32, Linux, MacOS, PlayStation2, Saturn, Windows, and Xbox.
SMS Power: Offers current news on ROM releases as well as downloads.