JavaScript Evaluador de Código

http://www.jslint.com/

IE Web Developer
http://www.taringa.net/posts/downloads/1796691/El-firebug-definitivo-para-Internet-Explorer-IE-WebDeveloper.html

Firebug para IE
http://getfirebug.com/lite

IE Tester
http://www.my-debugbar.com/wiki/IETester/HomePage

Companion.JS
http://www.my-debugbar.com/wiki/CompanionJS/HomePage
Instalación
http://www.anieto2k.com/2007/10/18/companionjs-el-firebug-de-internet-explorer/