JeremyEnglert

Materiell

This plugin will display the currently activated theme name and version number in the admin toolbar. It is helpful for developers who are often switching between similar themes or versions of themes.

Theme Info in Toolbar

A plugin to display the theme name and version number in the admin toolbar area.

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.

Theme Info in Toolbar vs which template file