CrabEmu is an video game console emulator for MacOS X and Dreamcast. Currently only the Sega Master System is emulated.

Changes:

* CrabEmu now runs on the Sega Dreamcast as well as Mac OS X.
* Support was added for the TMS 9918 modes of the SMS VDP, as well as for the SG-1000 console.
* Support for the Korean mapper.
* Too many bug fixes to mention.

http://crabemu.sourceforge.net/