
Re: fav applications, you can take a look at MacPorts ( http://www.macports.org/ ) or indeed build from scratch, if not someone already doing a build. To give you an idea on some of what comes standard on a Mac (10.5.8, ask again on Friday and you'll get specs for 10.6)
Python 2.5.1,
Ruby 1.8.6 (2008-08-11 patchlevel 287),
GNU bash version 3.2.17(1)-release,
ksh sh (AT&T Research) 1993-12-28 s+,
tcsh 6.14.00 (Astron) 2005-03-25
GNU Emacs 22.1.1,
VIM - Vi IMproved 7.2 (2008 Aug 9, compiled Nov 12 2008 15:36:47) Included patches: 1-22,
X11 XQuartz 2.1.6 (xorg-server 1.4.2-apple33)
And when you install the (free) tools, you get GCC 4.0.1