Gens is an emulator for Sega Mega Drive and runs on more operating systems – Linux, Mac OS X and Windows with DirectX. The initial release could only run on DOS – it came out in 1999. The latest version has been released in 2004 – meaning the project is discontinued now, but still in use. Its gaming compatibility is extremely well rated. The emulator works with 92% of all games with no problems whatsoever. About 5% of all games can be played with a few minor bugs, while 3% of them are not playable.
The emulator is available for free and comes with a bunch of handy features – such as windowed or full screen capabilities, joystick support, save game modes, SRAM and BRAM support, configuration file support and ZIP support, among many others. Gens was the first emulator to be able to provide safe state functionality for Mega CD.