PhilHilton

Adds shortcode for including a custom field on a page or post. 
Create a custom field on your post/page. Then use the following shortcode to include it on your site:
[embed_custom_field “field-name-here”]
This is useful for arbitrary bits of text or code that you don’t want the WYSIWYG editor to mangle and reformat.
This may work fine with versions older than 3.9.0 (and almost certainly does) but it has not been tested.
<ul>
<li>Note that the Gutenberg blocks content editor includes a “Custom HTML” block type, which negates the need for this plugin. It will NOT be maintained after December 31st, 2019.</li>
</ul>

Embed Custom Field

Adds shortcode for including a custom field on a page or post. Note that the Gutenberg blocks content editor includes a "Custom HTML" block  …

codecide

MetaShortcode is a lightweight module that allows users to display the value any custom (meta) field on the front-end using a simple shortcode.
The module can be disabled from the settings page. Important: The module is inactive by default. If you leave the Enabled box unchecked, the plugin will have no effect at all.
Pattern: [msc custom_field_name] 
Shortcodes with the pattern above will display the value stored in custom field name in the post.
Alternative pattern: {msc custom_field_name} 
An alternative shortcode pattern, which replaces square brackets with curly braces, can be activated if needed. This can be helpful if you need to use a custom field value as an attribute inside an existing shortcode definition. For example:
invalid: [shortcode name=”example” url=”[msc custom_url_field]”]…[/shortcode] 
valid: [shortcode name=”example” url=”{msc custom_url_field}”]…[/shortcode]
Note that unless you have a specific need for nesting shortcodes as attributes, you should leave this option disabled in the settings to avoid the slight (and unnecessary) performance degradation that the additional content filter involves.
<h3>Roadmap</h3>
<ul>
<li>Allow customizing the shortcode identifier</li>
</ul>
<h3>Donations</h3>
None needed.

MetaShortcode

MetaShortcode is a lightweight module that allows users to display the value any custom (meta) field on the front-end using a simple shortcode.

Embed Custom Field vs MetaShortcode