This is a free to use Drawpile server.
To host a session here, select the Remote option
in the Host dialog and enter draw.denden.world in the text box.
This is the official drawpile server of Denden. It is open to anyone, but if you're looking for a small online community to join, check out our mastodon or forums.
Sessions hosted (or just listed) here should abide by the common community guidelines.