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.

Barry Kooij

Never5

What The File adds an option to your toolbar showing what file and template parts are used to display the page you’re currently viewing.
You can click the file name to directly edit it through the theme editor, though I don’t recommend this for bigger changes.
What The File supports BuddyPress and Roots Theme based themes.
More information can be found <a href='http://www.barrykooij.com/what-the-file/' rel="nofollow ugc">here</a>.
<h4>Looking for a great related posts plugin for WordPress?</h4>
Another plugin I’ve built, that I’m very proud of is Related Posts for WordPress. Related Posts for WordPress offers you the ability to link related posts to each other with just 1 click! And it’s 100% free! <a href="https://wordpress.org/plugins/related-posts-for-wp/" rel="ugc">Check it out on the WordPress repository.</a>

What The File

This is great plugin to check templates file. It saves a lot of development time with 100% accuracy for me. Thanks to the developers team who worked for this plugin. Every WordPress developer should have this installed during development tier of their website.

Simple, but superb plugin

cool. very helpful !!!!

What The File is the best tool to find out what template parts are used to display the page you're currently viewing!

Admin Post Info vs What The File