You can clone with
"MVC framework making it easy to write realtime, collaborative applications that run in both Node.js and browsers."
Derby is in the very early stages of development, but looks very promising. It's opinionated and builds on many community contributions form the Node ecosphere (notably Socket.io).
Which would you rather do? My vote would be Derby over D3.
Derby works for me!
I'll close out the D3 proposal.