Mindvalley

This shortcode will allow you to include the content from any posts or pages.
Shortcode usage:
<ul>
<li>[mv_include id=’4′] (best for performance)</li>
<li>[mv_include slug=’the-post-slug’]</li>
<li>[mv_include path=’http://www.example.com/parent-page/sub-page/’]</li>
<li>[mv_include path=’parent-page/sub-page’]</li>
</ul>
The plugin also create a special post type that can be used for content that are for inclusion only.

Mindvalley Include Post Content

Creates shortcode [mv_include] to include content from another post/page.

tstafford

Adds a shortcode to include the content of a file or URL inside of a WordPress page or post.
Example:
Include the following in a page or post: 
[include_file url=http://example.org/somefile.txt]
This would include the content of http://example.org/somefile.txt into your page or post.

include-file

Adds a shortcode to include the content of a file or URL inside of a WordPress page or post.

Mindvalley Include Post Content vs include-file