The idea of brutalism is usually associated with architecture but the ethos has transferred to web design, creating a “ruggedness and lack of concern to look comfortable or easy”.
This is according to Brutalist Websites, a compendium of sites with nothing but the basics at hand. You won’t see any fancy fonts or CSS3 on these web pages. Some look archaic but on the whole, they bring web design and the internet back to the bare bones and it’s quite refreshing.

UPDATE: *sigh* once again, another site has been taken down or otherwise defunct. Not sure why but the site is covered with a Brutalist Websites Are Dead logo. If you’re good with Dev Tools, you can get rid of it and still navigate the site but it’s a shame. Then again, a lot of the websites on there were questionable from a brutalist design perspective.
UPDATE 2: The watermark is gone but the webmaster told me the site isn’t active and remains as an archive.