Since the Mac is basically a Unix with a very pretty interface, Ruby
runs very well. I know for a fact that you can get mysql-ruby running
(with some work-arounds ruby-talk:44685) and the openGL ruby library.
There are also Cocoa libraries for ruby, Cocoa being the windowing API
for Mac OS X.
I don’t know about tcl. You may need to install X Windows (another easy
install) but I don’t know. Anyone with more knowledge want to jump in?
The work-arounds I mention above usually have to do with the Mac’s
"strange" directory structure. More and more open source projects are
building support for this into their projects (mysql,X Windows) so it’s
becoming less of a problem. Plus more and more of these projects are
releasing binaries for the Mac, so owning a Mac is becoming easier than
ever for the Unix user.
And I’m always willing to help. Sometimes.
J o s e p h E r i c k s o n