dexxaye

This plugin allows user to add additional columns to admin posts and pages page. 
Now supports custom post type

Custom Admin Columns

This plugin allows user to add additional columns to admin posts and pages page.

demoify

Adds shortcodes to easily create columns in your posts or pages.
There are different column widths available from which you can make all combinations:
<ul>
<li>one_half (1/2)</li>
<li>one_third (1/3)</li>
<li>two_third (2/3)</li>
<li>one_fourth (1/4)</li>
<li>three_fourth (3/4)</li>
<li>one_fifth (1/5)</li>
<li>two_fifth (2/5)</li>
<li>three_fifth (3/5)</li>
<li>four_fifth (4/5)</li>
<li>one_sixth (1/6)</li>
<li>five_sixth (5/6)</li>
</ul>
There are also different buttons available :
*[button url=”#” color=”red”] Read More [/button]
You can also choose color like green, yellow, black, orange, blue.
A preset stylesheet is included, which you can also overwrite to you liking in your theme’s stylesheet.

Skeleton Shortcodes Collection

Adds shortcodes to easily create columns in your posts or pages.

Custom Admin Columns vs Skeleton Shortcodes Collection