Remix OS is basically a desktop version of Android, with floating windows and a start menu-style app drawer. It lets you run Android apps and games on your computer. In fact, you have the complete Android with the advantage of a mouse, keyboard, a bigger screen, and powerful processing.

You can even install it on your flash drive and use it on the pc as if you are on your android devices..
make imo calls,whatsapp chats and so on..

For more:
Visit http://www.eyereads.com/android-os-on-your-pc/