One with a bunch of cursors editing the same text would be great.
As of now found:
You must log in or register to comment.
HedgeDoc is really great, though it is markdown. OnlyOffice and Collabora also work pretty well.
I think it was collabora which can not do multiple cursors
CryptPad or Etherpad
You write code on those?
For quick collaborative coding, yes
deleted by creator
Red Hat hosts a public service for Eclipse Che.
https://www.eclipse.org/che/docs/che-7/hosted-che/hosted-che/