Here's a cool app for Windows that could've made that list:
You can literally change the way you relate to information on your desktop. Through Rainmeter and some customization, you can have dozens of "apps" on your desktop, from weather and news feeds, to system monitors, file browsers and media players. It also looks very cool! Everyone that sees my desktop immediately asks "Wow! What OS are you running?!?" cause it just looks like a futuristic halfbreed of Linux meets windows meets OSX meets 2035 or something.