jonkemp

Removes unwanted tags from your WordPress header.
The function wp_head; found in the header.php template file adds unnecessary tags to your WordPress template. These tags are the RSD, or Really Simple Discovery, link, the Windows Live Writer Link and the WordPress version number. This plugin will stop all 3 tags from being automatically added to your WordPress header.

WordPress Head Cleaner

Removes unwanted tags from your WordPress header.

Off Site Services

Allows admins to add Google Tag Manager code to your site and use it only when site is switched to “Search Engine Visibility”.
Use Settings->Reading: check/uncheck “Search Engine Visibility” and add code to “GTM code fields”.

GTM Code Visibility

Easily add Google Tag Manager code to your site and use it only when site is switched to "Search Engine Visibility".

WordPress Head Cleaner vs GTM Code Visibility