Peter Hebert

This plugin creates a simple contact form that allows you to customize the template to match your theme.
The contact form has only three fields, which is great for keeping things simple:
<ul>
<li>name</li>
<li>email</li>
<li>message</li>
</ul>
All fields are required in order to submit the form.
Upon successful submission, a simple thank you message will be displayed to the visitor. This message can be customized on the settings page.
<h3>Form Security</h3>
The plugin uses WordPress’ <a href="https://developer.wordpress.org/reference/functions/wp_nonce_field/" rel="nofollow ugc">nonce field</a> functionality, as well two honeypot fields in order to prevent spam submissions.
All submitted data is validated and sanitized using the <a href="https://github.com/Wixel/GUMP" rel="nofollow ugc">GUMP</a> PHP input validation class.
<h3>Form Templates</h3>
The form has three basic styles:
<ul>
<li>Plain – only basic styles applied; uses the browsers’ native field validation along side the server side validation</li>
<li>Bootstrap – <a href="https://getbootstrap.com/docs/4.0/components/forms/" rel="nofollow ugc">Bootstrap 4</a> markup and client side validation</li>
<li>Foundation – <a href="https://foundation.zurb.com/sites/docs/forms.html" rel="nofollow ugc">Foundation 6 for Sites</a> markup and Abide client-side validation</li>
</ul>
Note – the Bootstrap and Foundation templates only provide the HTML markup. Your theme must include either the Bootstrap 4 or Foundation 6 framework in order to make the form display and for the client-side validation to function properly.
In addition to these templates, you can override the form display with custom markup to match your theme. Simply copy the default template <code>templates/contact-form.php</code> to <code>contact-form/contact-form.php</code> within your theme, and then make sure to select ‘Default’ under ‘Form Template’ in the plugin settings page.

Themeable Contact Form

A simple contact form plugin that allows you to customize the template to match your theme

Mario Peshev

DevriX

This is a fully-functional sample skeleton plugin for plugin developers.
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/FfQpGD_MUbk?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
It serves as a startup code providing reference and working codebase for:
<ul>
<li>defining custom post types and taxonomies</li>
<li>creating admin pages</li>
<li>sample code of the Settings API implementation for admin pages</li>
<li>registration of activate/deactivate hooks</li>
<li>adding metaboxes on pages</li>
<li>creating sample shortcode</li>
<li>creating sample widget</li>
<li>creating AJAX requests storing sample data in the database</li>
<li>creating AJAX requests for fetching remote data with the HTTP API</li>
<li>adding frontend styles/scripts the right way</li>
<li>adding admin styles/scripts the right way</li>
<li>defining common constants for further use</li>
</ul>
and more. Use it freely as your plugin startup snippet.
Take the code as is for test and learning or use it when creating plugins for a solid base. To be extended with 
widget and shortcode samples.

DX Plugin Base

Startup plugin code for new plugin, including the archetype of standard features, admin and core functions to be used in new plugins.

Themeable Contact Form vs DX Plugin Base