Retro PC game players are surely familiar with Dosbox, the top-shelf emulator that makes playing games foam the ‘80s and ‘90s possible on modern machines. Boxer is Dosbox shined up for Apple computers. (Some call them "Macs.")
And from what I can tell from my dabbling with Boxer here on my work machine, it's a no-brainer download for any Mac gamer.
Not only does it look nice-including a Delicious Library-style take on your "Game Folder" complete with superfluous hardwood paneling graphics-but it seems to properly shift down my machine to proper speeds so that DOS games don't run wildly faster than is possible to play. (Something I've had a problem with default configurations with Dosbox in the past.)