>>2,
>>6Fine, I did some damn digging. Freeware VNs from www.renai.us should work fine on Macs.
Also, apparently the following VNs have Mac versions:
Animamundi
Yo-Jin-Bo
Date Warp
Bionic Heart
No, I'm not finding links, and I'm not testing them out.
Also, a program called Crossover Office can be used to play Windows VNs that don't have CD checks or DRM. It costs money to get though, so you may want to pirate that too (not finding links because I'm a lazy apathetic fuck).
You've also probably heard of Bootcamp, Virtual PC 7, and VMWare Fusion and the hassles of using them, so I won't reiterate them here.
Finally:
http://www.renpy.org/wiki/renpy/Mac_Launcher
http://games.renpy.org/
The two of them go together, so any games you find on the second link should work perfectly fine if you use the launcher from the first link.