DGen is a free, open source and portable emulator for Sega Genesis/Mega Drive systems. The latest version supports save states, interlace mode, Game Genie, Linux joystick support, compressed ROM images, and other nice features.
Note that DGen is primarily a command line program.
* Game Genie codes support
* PAL/NTSC, fullscreen modes
* Joypad / joystick support
* OpenGL textured video output
* Upscaling using hqx filters
* Low CPU usage on current hardware
* Portable (64-bit, endian-neutral)
* Screenshots, demos recording and playback