Osmose is a Sega Master System emulator.
"Here is the final version of Osmose. I will be absent from October 2005, for more than one year, with no possibility to write a single line of code (*cough*). That why i do this final release. Writing this emu was really a funny experience, especially with the help of SMSPOWER guys :-) Maybe will i continue its developement when back, but nothing is sure. By the way, i think i have offer a decent open source linux/windows SMS emulator, but now it's time to switch to something else. Thanks for all with bug reports, suggestions, and especially Bertram, who wrote wxOsmose frontend."