Window List
It displays a list of open windows at the bottom of the screen. You'll be able to minimise and restore windows by clicking on the window names.
Window List Mod
It's a modification of the Window List extension. It displays a list of open windows at the top of the screen and offers a few more customisations.
Best Answer
Yes, it's very easy. Press Super + [number] twice.
For instance, if you want to view all the Nautilus windows you have opened, press Super + 1 1 if Nautilus is the first item on your launcher.
Also, clicking on the icon of an active application that has more than one open window has the same effect.