Marco

Shortcode Simplex it’s a lightweight Shortcode plugin creator, permit all WP Admins to define new shortcode ( single or enclosed one ) to any kind of purpose. With it’s minimal human readable and 
intuitive interface you can create and manage all your Shortcode.

Shortcode Simplex

This lightweight plugin permit to create and manage easily user define Shortcode inside Wordpress.

Tanmoy

The normal Text widget allows you to insert arbitrary Text and/or HTML code. 
This allows that too, but also parses any inserted Shortcode and PHP code and executes smoothly.
All Shortcode must be enclosed in the standard [ and ] tags for it to be 
recognized. 
All PHP code must be enclosed in the standard tags for it to be 
recognized.

WP Sidebar Essential

Like the Text widget, but also allows working PHP code and shortcode to be inserted.

Shortcode Simplex vs WP Sidebar Essential