This is not production-ready (the code is slop), but I have a working shared document editor based on AT Proto's new private spaces alpha up! It's an experiment in how possible it is to combine something like @jakelazaroff.com 's AT ProtoCall but for WebRTC data channels, for private data + realtime
editor.henryfellerhoff.comPrivate DocumentsA realtime document editor built on AT Protocol Spaces and WebRTC