Roundabout is in the process of being reworked to sit on top of jack, rather than requiring Jetty like it currently does. It's actually super simple thanks to the power of Jack.
Very cool. George Moschovitis, who created Nitro (an elegant MVC-ish Web framework for Ruby that came out at the same time as Rails, but always struck me as cleaner and more 'Rubyish' than Rails) is now developing it in JavaScript.
http://github.com/boucher/roundabout/tree/master
My co-founder also ported Rack to JavaScript (called Jack)
http://github.com/tlrobinson/jack/tree/master
Roundabout is in the process of being reworked to sit on top of jack, rather than requiring Jetty like it currently does. It's actually super simple thanks to the power of Jack.