Joe Mattiello has updated his MixMan DM2 driver for Mac OS X. From his release announcement:
This version adds Mixxx support, which should mimic the Linux ALSA (Jan's) driver. This means it should be a drop in replacement with the same .xml config file already packaged. Note, this is different then the version for the DM2 under windows, which is a completely different setup.
This version also includes a more extendable Generic MIDI mode which supports 4 banks completely and a PD patch to get you started on custom setups.
Sites / DL's / Source :
The driver is also open source now, which the code available here.