geomagas

This plugin, like many others, provides a shortcode to add a simple contact form in any page of your site. The difference is that messages are stored on-site, using a custom post type. Instead of sending the whole message by e-mail, just a 
notification is sent in configurable intervals.
The shortcode syntax is the following:
<pre><code>[cpt-contact-form] </code></pre>
Please note that no default styling is provided, so if the form looks crappy, you’ll have to find a way to provide the 
relevant css yourself, by adjusting your child theme’s style.css or otherwise.
When a message is stored, shortcodes are stripped and html attributes are escaped. Although, I’m planning to add a configuration option for that in the future.
The plugin is in (hopefully correct) English, but a Greek translation is provided as well.

CPT Contact Form

A contact form that utilizes a custom post type to host messages on-site instead of directly sending them by e-mail.

George Pattichis

Simple CPT is a free WordPress plugin that lets you create custom post types and custom taxonomies (eg: categories, tags, etc.) directly from your admin dashboard without writing a single line code.
No more editing files manually. With Simple CPT you can create a new Custom Post Type in less than 1 minute.
This plugin is written using only native functions, included in WordPress core, so it does not in any way reduce the performance of your website and will not cause any compatibility problems. Simple CPT is completely free, it will save you time and it is compatible with almost all themes and plugins out there.
In just a few minutes you can adapt your WordPress site to any type of project in a professional and extremely efficient way, e.g. ecommerce, hotel, restaurant, events, portfolio, community websites etc.

Simple CPT

Simple CPT provides an easy to use interface for registering and managing custom post types and custom taxonomies.

CPT Contact Form vs Simple CPT