assembly tools are written in ruby. If you don’t want to roll on your own, I don’t think that you can do things like collect code on the client side or use a sc-server without rubies.
However, build tools are just a set of tools to help you grow. SC does not care about what is on your server. As long as your server returns json, you can go.
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http://wiki.sproutcore.com/DataStore-Using+Fixtures