Awesome

Quilljoy: Beautiful collaborative editing that mostly works

(stab 2)

All the code in here is meant as a motivating example for a talk on CRDTs.

The hope is that the risk of collaborators getting out of sync and then scribbling randomly all over each others' work will be self-evidently unacceptable. And then CRDTs will seem amazing by comparison.

There are other approaches, but they all have problems. See Clobberation and Univax.