Satourne is a Sega Saturn emulator that can play commercial games. That alone should not even make you think, just download! It's backed up by a brilliant author and each version is a suprice.
Download Satourne 2.0 Beta3 Now! (3059 Kb)
SSF is the first Saturn emulator that played commercial games and it did it directly from a CD. It's still under development.
Download SSF 0.10 prototype Now! (407 Kb)