The Backrooms Database http://backrooms-wiki.wikidot.com/

Creepypasta https://www.creepypasta.com/

The SCP Foundation https://scp-wiki.wikidot.com/

Fan Fiction

Archive of Our Own https://archiveofourown.org/

Fanfiction.net https://www.fanfiction.net/

Fimfiction.net https://www.fimfiction.net/

MS Paint Fan Adventures https://mspfa.com/