there is a unix env. that runs on top of macos... but its not free. Tenon
Intersystems' MachTen...

>> 6) Are there any ports of unix tools to macintosh? Specificly, development
>> tools would be helpfull. Also, there is a windows lib called cygwin that
>> provides a unix environment in windows, is there such a thing for
>> macintosh? A finder replacement that gave me a unix shell would be way
>> cool :)
>
>Um... yes, such tools definitely exist, but their names are deep in
>the foggy recesses of my brain.