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. Using IETester, it is possible to test web sites under IE6 without the need of a second computer or a virtual machine with an old XP/IE6 installed. Different IE versions can be opened on different tabs in the same window.
