testing web sites on internet explorer with mac

I remember one time my friend told me about this great app that lets develope开发者_如何学编程rs test a web site on multiple IE instances. I am just wondering whether any of you guys know the name of this app.

I think you're looking for IEs4OSX, which lets you run mutiple versions of IE in Windows emulation under OS X.

Alkaline lets you test your site with 17 windows browsers from your Mac. http://litmusapp.com/alkaline/

You can also search Google for Cross Browser Testing for other options.