Rafael Paulino

With this plugin you can place an iframe inside the TinyMCE text editor. 
You click a button in TinyMCE and a window appears to place the iframe data. 
Then just click on Ok and a shortcode is inserted with the iframe data and on the front the iframe is presented.
Com este plugin você consegue colocar um iframe dentro do editor de texto TinyMCE. 
Voce clica em um botão no TinyMCE e aparece uma janela para colocar os dados do iframe. 
Depois é só clicar em Ok e um shortcode é inserido com os dados do iframe e no front é apresentado o iframe.

Rafa TinyMCE Iframe

With this plugin you can place an iframe inside the TinyMCE text editor.

Stefano Lissa

Include Me helps to include in posts or pages external files usually to be shared 
between different posts or pages or that contains PHP or other code that can be 
compromised by the visual editor.
The use is immediate: the shortcode [includeme] is all that you need (see the documentation 
on <a href="https://www.satollo.net/plugins/include-me" rel="nofollow ugc">Include Me official page</a>).
The best way to use it is to include functionalities 
written in external PHP that will be rendered in post body or to include pieces of 
javascript that will be hard to add with WordPress editor.
Inclusions can be rendered with IFRAME if needed to create boxes that display 
external web pages.
This plugin is made of few line of code, ultralite!
Other plugins by Stefano Lissa:
<ul>
<li><a href="https://www.satollo.net/plugins/hyper-cache" rel="nofollow ugc">Hyper Cache</a></li>
<li><a href="https://www.thenewsletterplugin.com" rel="nofollow ugc">Newsletter</a></li>
<li><a href="https://www.satollo.net/plugins/header-footer" rel="nofollow ugc">Header and Footer</a></li>
<li><a href="https://www.satollo.net/plugins/thumbnails" rel="nofollow ugc">Thumbnails</a></li>
</ul>
<h4>Translation</h4>
You can contribute to translate this plugin in your language on <a href="https://translate.wordpress.org" rel="nofollow ugc">WordPress Translate</a>

Include Me

Include Me helps to include any external file (textual, HTML or PHP) in posts or pages.

Rafa TinyMCE Iframe vs Include Me