Dartwatch-client-server-example is a project mainly written in ..., it's free.
Example from dartwatch.com
This example implements a dart server (using fling) which sends and receives data from the client, which is a set of static html and dart files served from the same server.
Client/client.dart is the client side dart code Client/client.html is the client side host html Client/client-js.html is the output of htmlconverter (the output of the above 2 files converted to html + javascript). Server/server.dart is the server code