It is powerful editor for JavaScript, XUL/XBL, Laszlo, SVG, Silverlight and Yahoo! Widget development. The JavaScript editor provides features like code completion, syntax highlighting and content outline that helps developers productively create efficient JavaScript code. It can run as Standalone application or as Eclipse plugins.
AgPad is a small, fast and powerful freeware general purpose text editor. Currently this application supports code completion for JavaScript and syntax highlighting for many languages.