xBLADEx

As a developer its hard to identify right away what the permalink for the page or post is. Its tedious to click into each page or quick edit to view that information. 
This shows the page slug along with the template name if used to identify where and how a page or post is being used at a glance.

Admin Post Info

This plugin is helpful for showing the page or post slug url along with the template name on the all pages / post view.

gilles66

Need to know which template is used by WordPress to display your pages in the front office ? 
This plugin simply does this.
Show the name of the php file of your theme used to display the current page.Need to know which template is used by WordPress to display your pages in the front office ? 
This plugin simply does this.
Efficient and very easy to install, it will show you in the admin bar the name of the php file currently used to display the current page. 
The color of the text is different regarding the origin of the template(the theme, a parent theme, or a plugin) 
(icon author :http://www.megaicons.net/iconspack-1096/45043/)

which template file

Show the name of the php file of your theme used to display the current page.

Admin Post Info vs which template file