Mark Paschal has an interest kit of tools for Radio UserLand called... Kit.

Among other things, it has a web-based QuickScript form (meaning, you can enter and run UserTalk scripts on the server, from your browser), and a very cool outline/script editor done with DHTML/DOM/CSS/JS. This is a feature I would have LOVED to be able to do in 1997 when I was working on dynAuthor, a web-based Frontier object database browser and editor. The power didn't exist in the browsers back then.