Tomasz Tybulewicz

With this plugin you can use custom single.php page for selected categories, in the same way as for category.php.
<h3>Usage</h3>
In order to have a custom single.php page for category ‘Newest Offers’ with slug ‘newest-offers’ and 1337 id, create one of files in the theme directory: 
* single-newest-offers.php 
* single-1337.php

Single Page Per Category

This plugin enables themes to use custom single.php pages for categories.

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.

Single Page Per Category vs which template file