Because they spent more time on the code than they do on the wrappings. Forth is a really neat, minimalist language, that minimalism is probably a selection criterion for the way people would look at the websites hosting this stuff. Likely they see it as just another mass storage device.
Personally I think we could do with a bit more of this and less eye candy, I've seen tons of really nicely packaged blog posts announcing some project or other only to see it founder a couple of months, weeks or sometimes even days later.
I'd much prefer people first building something and announcing it on a 'crappy' web page like this.
I think that goes for a lot of programming languages. You're just "spoiled" by some sites of languages heavily involved in web programming (and especially the sites of the frameworks and libraries used for that). I'm actually a bit wary about "beautiful" sites, as often it means that this is "web designer code"…
Also: age. Not many Forth sites are very recent, so often you'll gaze into the abyss that is the 20th century web…
Personally I think we could do with a bit more of this and less eye candy, I've seen tons of really nicely packaged blog posts announcing some project or other only to see it founder a couple of months, weeks or sometimes even days later.
I'd much prefer people first building something and announcing it on a 'crappy' web page like this.