Optimal Layout is a great utility that fundamentally alters the way that I interact with my Mac. In short, it gives me the ability to use my keyboard to quickly change between windows. That might sound like what you're been doing with ⌘ + Tab, but there are a few important differences. The first is that you can choose not only which app you are switching to, but also which window in that app. Optimal Layout can even switch you to specific browser tabs in Safari or Google Chrome. You can use the mouse with Optimal Layout, but it works especially well for those who prefer the keyboard. Type ⌘ + Option/Alt + F and it will bring up a list of available windows. Start typing and it will match window names. When you find the one you want, simply pr