Here is EditArea, a free javascript editor for source code. (That is no way a WYSIWYG editor). This editor is designed to edit souce code files in a textarea. The main goal is to allow text formatting, search and replace and real-time syntax highlight (for small text).

will show you how I built a start page similar to Google IG in 7 nights using ASP.Net Ajax, .NET 3.0, Linq, DLinq and XLinq. I have logged my day to day development experience in this article and documented all the technical challenges, interesting discoveries and important design & architectural decisions. You will find the implementation quite close to actual Google IG. It has drag & drop enabled widgets, complete personalization of the pages, multi page feature and so on. It's not just a prototype or a sample project. It's a real living and breathing open source start page running at http://www.dropthings.com/ which you can use everyday. You are welcome to participate in the development and make widgets for the project.

Awesome Box is similar to Lokesh Dhakar's project Lightbox 2, using the Yahoo! UI Javascript Library instead of Script.aculo.us.

SWFObject is a small Javascript file used for embedding Macromedia Flash content. The script can detect the Flash plug-in in all major web browsers (on Mac and PC) and is designed to make embedding Flash movies as easy as possible. It is also very search engine friendly, degrades gracefully, can be used in valid HTML and XHTML 1.0 documents*, and is forward compatible, so it should work for years to come.

CodePress is web-based source code editor with syntax highlighting written in JavaScript that colors text in real time while it's being typed in the browser. It's a lightweight, extensible and simple (compared to similar web-based code editors) script with very good performance with large files (tested with up to 3000 lines).

Out of the box Atlas comes with a few drag and drop (DND) behaviors that can be attached to Atlas controls. One of them is the DragDropList behavior which makes it possible to move or copy data from one place to another. I’ve demonstrated this behavior in the past. If the built-in behaviors do not fit your needs, there is nothing that stops you from rolling your own. Atlas provides a generic DND API which is designed for extensibility.