Illuminate

Illuminate lets you cycle through your windows like Command-Tab lets you cycle through your applications.

It gives you large, easy to identify window screenshots so you can quickly switch to your desired window without squinting. Or you can use Quick Switch and just type in all or part of the window's title to jump directly there from anywhere.
Features:
- Cycle through your windows with big, beautiful thumbnails at the touch of a key
- Cycle through all the windows on your Mac, grouped by application
- Jump directly to a window from anywhere by typing in all or part of the title
- Cycle through your tabs in Safari and Chrome
- Find misplaced windows by search for text in their contents.
- Full AppleScript support
- See all your windows in one place using Illuminate's system wide window menu.