Pete Mall

Adds advanced plugin installation options to WordPress. Allows the user to install the development version of a plugin. Adds a link to the top of the plugin install page to install the development version of the plugin. If the development version is not available then a message is displayed at the top of the plugin install page.

WP Plugin Installer

Allows the user to install the development version of a plugin for testing purposes.

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.

WP Plugin Installer vs Simple Tag Manager