There are too many to count. WordPress, MediaWiki (on Fandom or Miraheze if you want), Mastodon, Blogger (you can still sign up apparently), Twitter, Linktree, Facebook, Google Docs, Google Drive, GitHub Gists in Markdown, ...

I went to a restaurant last night that had QR codes instead of a menu. The QR code took you to their Linktree, which linked to some PDFs on Google Drive. You could criticize that for looking unprofessional, but it sure looked better than a Frontpage site.

The other day I went looking for information on a neighborhood business that's a bit cagey about saying what they do. Their website (built by a consultancy that charges US$450, according to the Wayback Machine) seems to have been online from 02013 to 02018, but they have active pages on Facebook, Instagram, and YouTube, which apparently is good enough for them. (It turns out to be a school for mentally disabled teenagers, if I've interpreted the multiple layers of euphemisms correctly.)

So the niche of "build a web page for free without learning HTML" where Frontpage and GeoCities followed NaviPress is not just not dead; it's thriving.

Not sure what you mean by “no free tool does that today”, there are plenty of free site builders out there, both on the web and desktop apps. Even more if you consider “freemium” site builders.

That's how I learned HTML, building the page in Frontpage and then looking at the markup. I don't remember it being free though.

It was very easy to get from the usual “alternative” software sources.

It was, but it created some nightmare HTML that even FrontPage had trouble rendering.

We called it Don’tPage.

MS Word / LibreOffice Writer → Save as… → HTML :-)