The "how-to" section of this item about starting to use the Unix underpinnings of Mac OS X, to enable software of the kind being developed in the SourceForge community, is based on a bulletin board entry I posted at TechSurvivors on July 11 (2003). It may interest other people as new as I was to some really fabulous programmes.
Like somebody at TS, though I've been playing with a few cheap HTML editors of late, I'd been looking for the real works.
I found it, for free (via French graphic design mag 'Studio Multimédia') at no less august a source than the WWW consortium.
Amaya deserves to be much better known than it is.

The W3C's web editor and browser (being fetched and compiled in this picture), looks like this (Amaya site) screenshot. While it can't do everything, the consortium assumes you know nothing about HTML, XHTML or CSS should you like things that way. Amaya helps you build web pages which fully conform to the global standards and should work in any browser, provided it can handle all these languages.
Here's the "catch" to installing Amaya for those disinclined to explore the Terminal application and the remarkable but latent power of the operating system. You need to be running Apple's X11 or something similar, together with XFree86.
Moreover, none of an astonishing stock of software will work unless you've installed the developer tools that come with OS X, or are a very hefty download (400 MB plus) from the Apple Developer Connection site.
To the faint-hearted, all this sounds like a fearsome challenge, even for people who've already bunged in the developer tools, following the letter of Mac books which recommend this, but never explored them.

Well. It's worth it!
The process is far easier than such people might imagine. Here's how I did it (or rather, the way I would have gone about it after learning from experience and one false start).
The rewards of what amounts to a long afternoon's "work" also include the much vaunted and free, open source answer to Photoshop, 'The GIMP' (shown here in one shape), which has so many features and potential plug-ins I've only barely begun to learn about them.
Plus another powerful HTML editor called Bluefish.

Preamble over. Here's one relatively easy way to do it, while discovering the joys of Fink:

1. Have a quick read of "Fink and Apple's X11" at the generous Sao's Place, which explains things with clarity for the layman.
2. Bookmark Sao's work. It'll help you if you get stuck.
3. Download and install Apple's X11 from this Apple page. It's about 47MB.
4. From that same page, download and install the X11forMacOSXSDK. This name, less barbaric than it sounds, gives you a 4MB kit. Without it you're wasting your time, but it's tucked away in the bottom right corner.
5. Reboot your Mac.
6. Fetch the Fink binary installer via this download page (nearly 14 MB).
7. Double-click on the package. Once it's done its thing, your terminal will open and go to work.
   This will be interesting if you've never played with the terminal before. It'll ask you a few questions, but make it easy to give the right answers.
   When it suggests you take a coffee break, you could actually go shopping if you're quick. Even a fast Mac takes time to work the magic.
8. Reboot again. Should you care to look, you'll notice that at the root of your hard disk or OS X partition, plenty has happened inside places like a folder simply called "sw", or /sw, as it should be called.
   When doing this kind of thing, I keep tabs on what's going on by checking the "date modified".
9. A glitch? Fink failed to install, telling you it couldn't work on the /sw folder?
   In the picture here of Fink going in, an acute eye will notice a "lib" folder I had to take out of /sw. It was put there heaven knows when and by what and blocked the process. It sat on the desktop until such time as I'd checked it out and trashed it without a qualm.
10. Now the real magic begins. You've got Fink and no idea how to make it work.
    The hard -- and fun -- way is to read up a little more and use the terminal. I did this for the experience...
    The easy way is to download and install FinkCommander, a fine user interface.
11. Reboot yet again. By this time, I'd also have repaired permissions with the disk utility and run a file system check.
12. Open FinkCommander and behold with wonder a list of getting on for 1,300 pieces of open source software free for the taking and the using. Amaya, for instance, is close to the top, depending on how you decide to order the list.
13. Take the little time it takes to see how the thing works before trying it. It's very intuitive. And all key pages mentioned up to now have a FAQ.
14. Before grabbing what you fancy, there's one last step: you need first to fetch and install "system x-free86", which is also in that list.
    This you do by clicking on the item, then asking via the button in the top left of the toolbar for a binary package. The point of going for binaries is that Fink compiles the software and does all the work for you.
    The commander's window behaves like the terminal's. Unless you're a developer, you won't understand everything it whips through. But when you're prompted for answers, you'll get helpful suggestions in plain English.

The various applications you get work simply by opening X11R, as it's called, and summoning them up with the appropriate commands. And since developers are not all incomprehensible geeks, most of these programmes are very user-friendly. Help commands abound, should you need them.

Could you really ask for more?
Well, yes (update), I did. I've also installed XDarwin.
This is not a necessary step nor perhaps even an interesting one unless you're as curious as I am. And it also costs both a fistful of euros (27.99) and effort to get it and X11R to cooperate harmoniously.
As for a neat interface for these tools, Karl at TS recommended I fetch OroborOSX while I was at it.
This -- thanks, kps -- turned out to be a good tip.