Given the final look of your site depends entirely on the skin you have chosen and the modules you are using - there is no tool as such that would be of much point.

Many developer setup a Virtualbox VM system that runs different versions of browsers and platforms - that way you can quickly switch thru different looks and test layouts - we run an old xp VM, and windows 7. and windows 8 VM, and a Linux VM and a osX VM

You can download prebuilt test VMs from microsoft to do just this sort of thing - have a look at

https://www.modern.ie/en-us

And also check out this blog - it has a good overview of things too

http://blog.reybango.com/2013/02/04/making-internet-explorer-testing-easier-with-new-ie-vms/

Westa