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.

Features:

-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.
-Accurate auto-frameskip.
-Configurable keyboard configuration.
-Joystick support.

What's new in Osmose 0-8-2 (mainly sn76489 bugs corrections):

-Small modification in main.cpp: The ROM filename can be at any position
on the command line. So osmose can be used with file browser that
generate command line with filename as last argument.(Bruce aka Nintendont request).
-Change sound buffer size to reduce emulation/sound desynchro.
-Correct a bug in SN76489 that causes major distortion in some games.
-Correct a bug in SN76489 that cause change on Channel2 frequency not to be made
on Channel3 when it should be.

Here is an overview of osmose video filters:

Here are few screenshots: