Osmose is a Sega Master System / Gamegear console emulator. The emulator is
released as open source project, under GPL license and exists for both Linux and windows.

Note : Due to the major change for the GUI, this version is a Beta. So, if you try this version, please let me know how it works for you especially GUI related things. GUI is around 7000 lines of code and certainly not bug free. There is actually no windows version. Osmose is developped under Linux and porting a beta isn't my priority.

Features:

-Open GL based GUI.
-SMS emulation: Good compatibility. At this stage, the emulator can run* 96% of commercial
games and public demos, except games that relies on codemaster mapper, which work
but does not have proper video mode emulated.
-Game Gear emulation : Good compatibility. At this stage, the emulator can run 98.0% of
game gear ROMS.
-SN76489 Sound is supported, but still needs work.
-support. for .ZIP .SMS and .GG format.
-Video filters: monochrom, scanline, scale2x, bilinear, nearest neighbour, scale2xscanline (fullscreen option always available).
-Pad(keyboard or joystick mapped), Sport Paddle (mouse mapped) emulation.
-PAL/NTSC Timing.
-Japanese/Export console.
-In game Screenshots, GFX rip, sound shot.
-Configurable (file edition) keyboard configuration.
-Joystick support.

What's new in Osmose 0-9-0b:

-Osmose is now a GUI based application. A basic OpenGL toolkit was written for Osmose since tested toolkit were unable to get 60Hz refresh guaranted. Maybe will i try QT libraries. GUI was Osmose's most asked feature.
-Remove FPS and RDTSC instruction non portable code.
-No more command line options are needed. All is done from GUI now.
-Osmose configuration is now stored into $HOME/.osmose directory under Linux.
Config file is named osmose.conf
-Configuration fileand key mapping has changed too.
-Joystick 1 is actually used with player 1.

Here are few screenshots: