Well, there is one. but it's an abandonware site and i don't dare mention it's name. It's not the garden. I just finished mirroring it and it's about 90 GB worth of archives.
Most of the games are very old and probably play fine on my iMac 233 or even my trustey old Quadra 650. But some are very new and require a lot more CPU cycles, like Max Payne or Silent Hill 2 for example.
Here is another list, alas without download links:
https://en.wikipedia.org/wiki/List_of_Macintosh_games