Currently IDE support is available for IntelliJ IDEA Ultimate Edition and Jaggery Editor of WSO2 Developer Studio enbling you to create .jag file on your own with syntax highlighting and code completion support for Jaggery, HTML and Javascript.
Jaggery debugging feature is enabled by the means of Rhino JavaScript Debugger. Eclipse IDE has plugin support for Remote Javascript debugging with Rhino. Support is given for both client and server side.This feature is currently in the pre-alpha phase.