David Attard

The DC WordPress popup plugin allows you to create your own customized popups for any page or post on your WordPress installation. This is great if you want to make sure you create relevant popups for the different content on your site, making sure you increase the conversion rates of each of your pages.
The WordPress popup plugin allows you to customize all of the HTML which is displayed in the popup, and also allows you to have specific parameters for each popup.
<ul>
<li>Ability to enable / disable the wordpress popup plugin window at will</li>
<li>Customize the text of the header to whatever you prefer</li>
<li>Customize all of the HTML of the popup</li>
<li>Choose whether to show the plugin on the following pages / sections (Home, Posts, Pages, Everywhere else)</li>
<li>Choose whether to show it to Logged in Users or Logged out Users.</li>
<li>Choose whether you ALWAYS want to show the plugin or how often you would like to show the plugin</li>
<li>Define the number of seconds between showing the popup</li>
<li>Choose whether you want to lock the scrolling ability whilst the popup is showing</li>
</ul>

DC Popup Custom

The DC WordPress popup plugin allows you to create your own customized popups for any page or post on your WordPress installation.

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.

DC Popup Custom vs Code Widget