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.

Known problems and limitations:
- When resizing, the content may disappear. I am working to correct it on the next version.
- The Previous/Next buttons are not working properly
- Focus is not working properly
- Java applets are not working
- Flash is not working on IE6 instance
NOTE: If you are a Firefox user, then you can install an extension called “IE NetRenderer” which can also do the same job:



