camdagr8

This plugin creates a thumbnail list of the available page templates. 
 
Clicking a thumbnail updates the <code>Page Attributes -> Templates</code> drop down to the corresponding page template.

Page Template Thumbnails

This plugin creates a thumbnail list of the available page templates.

WebMan Design | Oliver Juhas

Helpful tool displaying name of a (theme) template assigned to a post, page or public custom post type in admin posts list table.

What Singular Template

Displays name of template assigned to a post, page or public custom post type in admin posts list table.

Page Template Thumbnails vs What Singular Template