Red_query is a project mainly written in Ruby, it's free.
jQuery based Framework for Red
Provides DOM, Ajax, JSON functionality for Red. Heavy usage of jQuery. Its been developed for my personal fork of Red: http://github.com/julius/red
Of course you need jQuery and your own source. In addition you need a little startup code.
<script src="jquery.js"></script>
<!-- red_query startup code -->
<script type='text/javascript'>
jQuery.noConflict();
jQuery(document).ready(function(){
if (typeof c$Document !== "undefined")
c$Document.m$ready_bang();
else
throw "BIG problem with Red code";
});
</script>
<script src="your_red_file.js"></script>
Your main Red file should
require 'red_query'
And your compilation should include
red -I/path/to/red_query your_red_file