An exceedingly powerful
programming environment, influenced by
Unix yet not wholly like. Not as bad as
DOS, often not as good as Unix (although sometimes much better, it is what the true
hacker wants to use. And it's free, wh. means the hacker&can actually use it.
I have been recently using it to write a homebrewing program in C++. It's been quite a learning experience. I advise any MacOS programmer to try it out.