BlastEm has the goal of being an extremely accurate Genesis emulator while still running on relatively modest hardware by using advanced techniques...
* savestates
* integrated debugger
* GDB remote debugging
* joystick/gamepad support
* Mega/Sega Mouse support
* save RAM and EEPROM support
* Sonic & Knuckles lock-on
* turbo and slow modes
* configurable low pass filter
* single pass GLSL shaders (though there are no interesting ones presently)