Spencer Brown

This plugin offers you the ability to add custom page template files to your WordPress installation without having to manage 
theme folders or use a ftp client. Simply upload the custom template file you have been working on and it will be registered 
with WordPress as a template option for your pages. This plugin is straight to the point and has a clean user interface using 
W3.CSS.
Plugin menu is located under ‘Appearance’ menu.
Attribution: This post online and code on github by wpexplorer: 
http://www.wpexplorer.com/wordpress-page-templates-plugin/ 
https://github.com/wpexplorer/page-templater

Custom Page Templates Setup

Easily add custom page templates without having to use ftp or keep track of changing themes.

Daniel Sedmak

Simple Tag Manager is a simple plugin created in order to easily install Google Tag Manager and Google Analytics in your WordPress website. 
Just copy and paste the property code or the tracking ID and … it’s done!

Simple Tag Manager

Easily and automatically add Google Tag Manager and Google Analytics in your website.

Custom Page Templates Setup vs Simple Tag Manager