How are services like myBalsamiq (web version of Balsamiq) built ? Is there a set of tools for this kind of drag and drop prototyping and wire-framing? Or it just rely heavily on javascript.
Having never used myBalsamiq, I'm not sure what they built it in, but some of the tools you could use:<p>Flash, jQuery, ExtJS, HTML5<p>Isn't their desktop app built in Adobe Air? or have they moved away from that? I haven't used it in a while.