Alex Mansfield

This plugin allows you to easily add code to your pages and posts without worrying about what the WordPress editor will do to it. You can embed HTML, video embed codes, Paypal forms, Google maps and more. Please note: this plugin will not allow you to run server side scripts such as PHP.
To use the plugin, all you have to do is create a custom field (you can name it anything), place your code in the new custom field, and place the following shortcode into your post where you want the code to go:
<pre><code>[easyembed field="name-of-custom-field"]
</code></pre>

Easy Embed

Allows any code to be easily embedded in posts and pages.

Ajay

WebberZone

Do you want to customize your site with code but don’t want to edit your theme files or worry about losing your changes when you switch themes? Do you want to add analytics, site verification, custom CSS, or any other code to your site without using multiple plugins? Do you want complete control over where and when you display your code snippets on your site?
If you answered yes to any of the above questions, WebberZone Snippetz is the perfect plugin!
<a href="https://webberzone.com/plugins/add-to-all/" rel="nofollow ugc">WebberZone Snippetz</a> (formerly Add to All) is a simple yet powerful plugin that allows you to create and manage custom snippets of HTML, CSS, or JS code and add them to your header, footer, content, or feed. You can also choose where and when to display your snippets based on criteria such as post IDs, post types, categories, tags, and more.
WebberZone Snippetz comes with out-of-the-box support for Google Analytics and Statcounter. It lets you easily add meta tags to verify your site with Google, Bing, and Pinterest.
WebberZone Snippetz also enhances your site’s feed with a copyright notice and a link to the post. It also comes with many actions and filters to extend its functionality.
Here are some of the key features of WebberZone Snippetz:
<ul>
<li>Create custom snippets with HTML, CSS or JS code</li>
<li>Add snippets to your header, footer, content or feed</li>
<li>Choose where and when to display your snippets based on post IDs, post types, categories, tags, and more</li>
<li>Support for Google Analytics and Statcounter</li>
<li>Site verification for Google, Bing and Pinterest</li>
<li>No need to edit theme files or lose changes when switching themes</li>
</ul>
WebberZone Snippetz is the ultimate snippet manager for WordPress users who want to customize their site with code. Download it today and see the difference! 
WebberZone Snippetz is one of the many plugins developed by WebberZone. Check out our other plugins:
<ul>
<li><a href="https://wordpress.org/plugins/contextual-related-posts/" rel="ugc">Contextual Related Posts</a> – Display related posts on your WordPress blog and feed</li>
<li><a href="https://wordpress.org/plugins/top-10/" rel="ugc">Top 10</a> – Track daily and total visits on your blog posts and display the popular and trending posts</li>
<li><a href="https://wordpress.org/plugins/knowledgebase/" rel="ugc">Knowledge Base</a> – Create a knowledge base or FAQ section on your WordPress site</li>
<li><a href="https://wordpress.org/plugins/better-search/" rel="ugc">Better Search</a> – Enhance the default WordPress search with contextual results sorted by relevance</li>
<li><a href="https://wordpress.org/plugins/autoclose/" rel="ugc">Auto-Close</a> – Automatically close comments, pingbacks and trackbacks and manage revisions</li>
</ul>

WebberZone Snippetz – Header, Body and Footer manager

The ultimate snippet manager for WordPress. Create and manage custom HTML, CSS, or JS code snippets and control where and when they are displayed.

Easy Embed vs WebberZone Snippetz – Header, Body and Footer manager