Homebrew Wiki?

Something I’m curious about - has there been any attempt to collate people’s RPG homebrew in a single wiki? I know that several RPGs have wikis like that, where people can upload and save their characters, NPCs, or story ideas.

The official Sentinels wiki doesn’t really have a space for that (and honestly, mixing homebrew and canon sources in a single wiki has a way of getting confusing pretty quickly) but I was curious if anyone had tried to get one off the ground.