Question: I just got a NFC Reader (ACS ACR122U), but the SDK available is for Windows only. 

Where can I find a SDK for Mac OSX? I already contacted helpdesk of the hardware provider but until now I don't get any response from them.

Answer: 
libnfc works with the ACR122U, according to <http://nfc-tools.org/index.php?title=ACR122> .

To install libnfc on OSX, see: <http://nfc-tools.org/index.php?title=Libnfc#Mac_OS_X>
To add privileges you run `vigr` and `vigr -s` on OSX.
On linux you can do the same or use 

```
usermod <user> -G <group>

```

Where group is `libnfc` or `nfc` or something like that.