It's not, we're serious about Dart :)
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The answer is contained in your question, I think.
Exactly :) even more-so given the list is incomplete.
there are others? what other frameworks render the page server and client side?
http://derbyjs.com/#why_not_use_rails_and_backbone
edit: ok I forgot http://www.socketstream.org/ but regardless, the realtime single page app sector really is dominated by those four products. everything else is already obsolete.