PUBLIC MARKS with tags free & ie

IETester is a free WebBrowser that allows you to have the rendering and javascript engines of IE8 beta 1, IE7 IE 6 and IE5.5 on Vista and XP, as well as the installed IE in the same process.

Fiddler is a HTTP Debugging Proxy which logs all HTTP traffic between your computer and the Internet.

CSSVista is a free Windows application for web developers which lets you edit your CSS code live in both Internet Explorer and Firefox simultaneously. By building your sites to work in both IE 6 and Firefox you'll be compatible with 88% of your visitors' web browsers*. To cover the other 12%, you may like to look at our paid-for browser compatibility service, SiteVista. Yes, that's why this software is free! :-)