Metabox Area Wordpress Plugin - Rating, Reviews, Demo & Download
Plugin Description
Add the option for a third column on the Edit Post/Page/Custom post type screens. This is useful if you have a lot of boxes on your edit screen, from custom taxonomies and plugins.
Also adds a pair of mini columns underneath the content editor, giving you space for more small boxes.
P.S. It’s branch of the not working “Third Column” plugin.