The software provides gaming emulation for various platforms such as Apple I and II, Atari, Gameboy, and more.
One of the coolest things about MESS is how actively it's being developed. As the creators of the software discover more about how different systems work, they're constantly adding support for new consoles and computers. This means that there are always new releases of MESS coming out, so you'll want to check back frequently to see the latest version.
MESS has been ported for use on many different systems, including DOS, Windows, UNIX, and Macintosh. If you're using a Mac, you'll want to look for MacMESS, which is the name of the Macintosh port of MESS. This version of the software is largely based on MacMAME, so the user interface will feel pretty familiar if you've used that software before.
Overall, MESS is an excellent choice for anyone who wants to play classic games from older console and computer systems. The software does a great job of mimicking the original hardware, and the constantly-updated support means you'll always have access to new games to play.