From Lanny's link, I had done the 'copy Snow Leopard token files' and it did work. However, i had to get a new card and it was an oberthur card, so I tried the OpenSC solution and it seems to work better (more consistently) than anything else I've used, including the stuff built into Leopard and SL.
For sale is a used SCR3310v2.0 USB smart card reader.The SCR3310v2.0 reads CAC cards and a variety of other smart cards. This unit is compatible with Windows XP/7/8 and MacOS. If you prefer using a Mac to a PC, it can be difficult to find the right CAC card reader to work well with your machine. So many CAC readers that might work well with Windows run into problems with Apple software and products. Look for “SCRx31 USB Smart Card Reader. ” If the Smart Card reader is present, look at 'Version' in the lower right corner of this box: If you have a number below 5.18, you need to update your firmware to 5.25.
Cac Card Reader Software For Mac
Cac Card Reader Software Download For Mac
Thursby, as linked by etresoft, has a $30 program that is like the OpenSC package. The AdmitMac package is way overkill (price and functionality) for most users that only need to access CAC enabled sites. I helped a friend install the Thursby package. It originally worked, but now he says it doesn't. I haven't had a chance to get hold of his computer again to see what is wrong. He's horribly computer illiterate and computes sense that.