what is this plugin on bottom right corner of websites?

I have found on most of the site "ics_preview_panel". But not finding on google. what is this pluging called and fro where i can get this? her are the images of "ics_preview_panel".

![][1] ![ ![this example can be found on http://ift.tt/1ACUgS9] ![this example can be found on http://ift.tt/1HB1xPE] ][2]

on bottom right there is a preview pane.