alt+tab application switcher like in windows 7

I don't remember what Windows 7 looks like, but we have different switchers by default in Ubuntu, like Super+W

• Install compizconfig-settings-manager.Run the below commands to install ccsm,

  sudo apt-get install compizconfig-settings-manager
  sudo apt-get install compiz-plugins
  

• Open ccsm--->Window management--->Enable Shift switcher plugin.

• After enabling shift switcher press Shift+Super+s.

• Now you can press arrow keys to swap between windows.

You can see all unity shorcuts if you keep Super(windows/command key) pressed.

Super+W to show all windows opened.