It's been online for a little over a year so there's a fair bit of stuff to browse if you want to look around (so much that I even made a poster https://ascii-collab.app/poster.png)

There are other websites like yourworldoftext that do this but ascii-collab has some extra features like per-user undo/redo, box selection, a color highlight mode to see who made particular changes, and there's admin tools so I can remove spam.

The code is open sourced here https://github.com/MartinSStewart/ascii-collab if anyone is interested.

Enjoy!