Something I was introduced to on another server.

aggie.io
This site is basically a drawing tool that's online, and can be used by multiple people simultaneously.

I've made a canvas for you lot to scrawl, doodle, or whatever on.

Registering an account is optional, but it lets you save your tool settings and jump back to the last canvas you edited from the homepage.

To start editing, create a new layer or grab control of an existing one that isn't occupied by double clicking and doodle away.

Pale Moon users: Disable the stabiliser on the Brush tool to avoid crashes.

Kafuka @ aggie.io