Although I don’t have a Mac (and BasiliskII refuses to work on my computer), there are plenty of Macintosh goodies available at the Mac Hut
Okay… I know, it’s been back for a while. But in case some people still haven’t found it, here. New layout’s pretty nice.
If you want to see the old layout, here’s a mirror. I don’t think you can download from it, though.
If you have no idea what I’m talking about — HOTU is an abandonware site. The webhost went bankrupt so it went offline for a month or so. But it was brought back online.
It’s actually SimCity Classic! The name was changed due to trademarking, but the game stays the same.
From The Oregon Trail Deluxe (an old school game that some of you may have played in elementry school):

Go figure.
Plenty of games for old systems here, including the Commodore 64!
If you want games for various older computers — such as the C64 or Atari — check out the game archives. There are a lot there, that you can run with emulators.
Some of you may remember Railroad Tycoon — an old DOS game released in 1990, which launched the “tycoon” genre.
Well, you can download it for free. Simply go to the Sid Meier’s Railroads website, go under “Downloads,” and it’s in there.
It comes preloaded with DOSBox, so you don’t have to install anything extra.
Have fun!
If you’ve ever longed to play the original SimCity, you can, online!
Free registration is required.