I run https://campaignwiki.org/ where role-playing game groups can get a wiki for their campaigns. It's ugly, but it's free and it works – in fact it has been working fine for 12 years! The first edit of the main page was 2011-02-17. 🤩

The site also hosts a bunch of RPG related web apps I wrote:
https://campaignwiki.org/wiki/Apps

And it aggregates blog posts. Let me know if you want to get listed!
https://campaignwiki.org/rpg/

There's also an archive of One Page Dungeon Contests:
https://campaignwiki.org/one/

#RPG