When you design websites it becomes important that you check the compatibility and its rendering in different web browsers. IETester is a simple application which allows users to have the rendering and JavaScript engines of IE9 preview, IE8, IE7 IE 6 and IE5.5 on Windows 7, Vista and XP, as well as the installed IE in the same process. You can enter the URL and the website is opening in all versions of IE simultaneously.
You can also open websites in different version of IE separately.
Apart from this, it also features few development tools like viewing the source code etc. You can also selectively disable rendering engines like Javascript, ActiveX etc.
