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.

sebastianost

Usage:
To include a post in another post or page, just add [ipost id=id-of-post] and the post will apper instead of [ipost id=id-of-post]  
You can also fetch the post by permalink: [ipost permalink=”?p=4″]. 
You can also set silence to true/false depending if you want debug information to be printed. Defalut is true.(no debug information)

iPost

Plugin that makes it super easy to include one or more posts in another post.

include-file vs iPost