Like Free Open Source Software (I'm guessing here).
There are some parts around if you look.
[link|http://www.htmlarea.com/|http://www.htmlarea.com/] is a directory of wysiwyg text editors written as both js/dhtml and craplets (which we avoid because of response times).
Dynamic table widget: [link|http://www.activewidgets.com/grid/|http://www.activewidgets.com/grid/]
Calendar: [link|http://www.dynarch.com/projects/calendar/|http://www.dynarch.c...rojects/calendar/]
Tree widget: [link|http://www.zapatec.com/website/main/zptree/html.html|http://www.zapatec.c.../zptree/html.html]
There's even a simple working spreadsheet around somewhere (can't find it just now).
Google away though - lots of stuff. One of those nifty text editors might be a nice addition to iwethey.
These are just examples. Its only recently that people have figured out that you can build non-trivial widgets using js/css/dhtml. Google maps is a great example as is the search as you type feature.