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.

Seth Alling

Up until recently, WordPress gave two options: You could either disable comments and trackbacks by default for all pages and posts, or you could have them active by default. In WordPress version 4.3, this finally changed so comments are always disabled on new pages.
While the new change makes it easier for many of the sites, it make it harder for people who need to get the reverse and enable comments on all pages, or if they need to change the default for a custom post type. This plugin allows you to choose whether comments are enabled or disabled by default on all new posts, pages and custom post types, while still giving the ability to individually enable comments on posts or pages.
Also, this plugin provides a way to quickly disable all comments or pingbacks for a specific custom post type. It directly interacts with your database to modify the status, so it is highly recommended that you backup your database first. There shouldn’t be any issues using this feature, but it’s always good to play it safe.
<a href="https://github.com/sethta/no-page-comment" title="No Page Comment Development on Github" rel="nofollow ugc">View No Page Comment Development on Github</a>
<a href="https://github.com/sethta/no-page-comment/issues" title="Report an Issue about No Page Comment on Github" rel="nofollow ugc">Please Report any Issues about No Page Comment on Github</a>
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No Page Comment

An admin interface to control the default comment and trackback settings on new posts, pages and custom post types.

CPT Contact Form vs No Page Comment