Glenn Welser

Post Type Select for Advanced Custom Fields provides a select field for choosing a WordPress Post Type.
<h4>Compatibility</h4>
This ACF field type is compatible with: 
* ACF 5 
* ACF 4

Post Type Select Field for Advanced Custom Fields

Custom field definition for Advanced Custom Fields for a select box populated with post types. Add-on for Advanced Custom Fields.

thenbrent

This plugin implements the <a href="http://harvesthq.github.com/chosen/" rel="nofollow ugc">Chosen jQuery Plugin</a> for WordPress.
<a href="http://harvesthq.github.com/chosen/" rel="nofollow ugc">Chosen</a> makes long, unwieldy select boxes much more user-friendly.
This plugin applies Chosen to any select box in your post and page content. The relevant Javascript & CSS files are only loaded if the post in question includes a select box or a <code>[contact-form]</code> shortcode.
The <a href="https://wordpress.org/extend/plugins/grunion-contact-form/" rel="ugc">Grunion Contact Form</a> & <a href="https://wordpress.org/extend/plugins/grunion-contact-form/" rel="ugc">Contact Form 7</a> plugins both use a the <code>[contact-form]</code> shortcode.
If you need to force the Chosen script & styles to load on a page, simply include <code>[chosen]</code> within the page.

Chosen for WordPress

Make long, unwieldy select boxes much more user-friendly.

Post Type Select Field for Advanced Custom Fields vs Chosen for WordPress