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.

Here you can download the deb package

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: