Alvaro wrote an article on using a Bus Blaster + openOCD on OSX Mavericks:
I’ve been using the Dangerous Prototypes Bus Blaster along with openOCD to program/debug my LPC1769 microcontroller. It’s been a while since I did anything, so when I tried again last week and couldn’t get it to work, I was slightly confused. The only change (that I was aware of) was an OSX upgrade from Mountain Lion to Mavericks.
You can get a Bus Blaster v3 for $34.95.