What I use for building my sites, etc.

A Macintosh G4

All my good work is done on a Macintosh G4, running under OS X 10.2.6. I have my local Apache web serving installed in such manner as to be able to see for myself what the server side includes and cgi-scripts do, before uploading my pages.
Things work as expected, for mainly two reasons: MacIntosh, Open Source, and Unix software on the one hand, and a bunch of system operators who help me whenever I get stuck. Cheers.

Software, both Open source and commercial

All of the software I use is reliable, highly manipulable and intuitive, in a word, Mac-like.
As my main HTML editor I use the beautifully crafted BBEdit.

Browsers

My main browser is Netscape 7.0 and Mozilla, based on open source Gecko-machine. Apart from this, I use Safari, IE (if need to) and Navigator.

Blapp

I use Blapp to synchronise through the unix-command rsync, which uses SSH, my blosxom weblog-files from local to public.

Fugu

Now and then I use Fugu to synchronise my sites from local to public, also over SFTP. Brilliant software, Unix-based. Get it. For free.

Interarchy

But I standardly use Interarchy, which is great! Apparently (I only just found out), it can check all the links, both internal and external, of your website and present a clear overview of faulty links per page! Wow.
I also bought RBrowser to do SFTP (which is great too, but has a few quircks).
Oh, I almost forgot: SSH Agent, to build the tunnels to SFTP over.
Thus, we make do. And happily ever after.