The jQuery API extension seems to be the farthest along offering code completion, code hints, code coloring, and a bunch of snippets that early beta users liked. The Prototype API extension only has basic code completion but is due for an update in the next few weeks to offer extended code hints. The code hints appear when editing a JS document and XTND.us has a short video of an extension in use. The demo video and downloads are freely available at http://xtnd.us. We use these tools every day and help train people… it’s time the tools get better.
Posted by Rey Bango at 7:00 am