In just three and a half weeks of devoted work, we have managed to finally get Bol Processor BP2 to launch and run on OS X! As you can see from the screenshots, there are many cosmetic issues to resolve. And the Open, Save, and Print commands do not work, nor is there any real-time MIDI at this point. But it is possible to compile grammars and produce output in the Data window. So, BP2 on OS X is coming!
(2012) For up-to-date screenshots, see the main project page.