Dead Writers Society

Light and fast wp_head() cleaner. Just activate it and all unnecessary code will be deleted from site header section. It will improve loading speed of your website.
This plugin will remove:
<ul>
<li>WordPress version</li>
<li>shortlink</li>
<li>Really Simple Discovery link</li>
<li>RSS feed links</li>
<li>all extra RSS feed links</li>
<li>wlwmanifest.xml</li>
<li>meta rel=dns-prefetch href=//s.w.org</li>
<li>the next and previous post links</li>
<li>Emoji icons</li>
<li>WordPress REST API</li>
<li>oEmbed</li>
</ul>
Feeds (RSS, RSS2, Atom & RDF) and comments feeds will be disabled and redirected to home page for security reasons.

Nietzsche – WP Head Cleaner

This plugin cleans up the wp_head() and removes unnecessary code.

chriscarvache

Enhanced Header / Footer Injections allows you to insert HTML code into the header and footer sections of your templates on a page per page basis. This also works with custom post types, archive pages, the 404 page, the main blog page and the front page (if used). The plugin is designed to help speed up the development process when creating custom sites for clients.

Enhanced Header / Footer Injections

Add code to the header and footer sections of your site on a page-per-page basis.

Nietzsche – WP Head Cleaner vs Enhanced Header / Footer Injections