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.

Sharaz Shahid

Code Widget is simple widget allows you to insert any arbitrary Text/HTML and run PHP Code or Short Code. This Widget parses PHP code into simple text and much more.
Only users with the unfiltered_html role will be allowed to insert unfiltered HTML. This includes PHP code, so users without admin or editor permissions will not be able to use this to execute code, even if they have widget editing permissions. 
This plugin is developed and maintained by <a href="https://twitter.com/sharazghouri1" rel="nofollow ugc">Sharaz Shahid</a>

Code Widget

Code widget help  to  add  Short Code, PHP Code, HTML, and Simple Text in widget.

Shortcode Simplex vs Code Widget