Talika is a gnome applet that puts all opened windows’ icons on the panel and you can switch windows using these icons.It looks like the Windows taskbar icons at right bottom of screen.You can left-click on one icon to focus on the windows and right-click on one icon to choose Close,Minimize,Move,and so on.
Alternatively,you can install Talika from PPA:
open terminal from Applications->Accessories->Terminal and execute following commands
sudo add-apt-repository ppa:webupd8team/talika sudo apt-get update sudo apt-get install talika
Then,right-click on panel and choose “Add to panel”,type talika in top box and click Add
See,all opened windows’ icons display on the panel: