JorgeAmVF

autometa’s THUMB is a simple plugin that uses the following shortcode:
<ul>
<li><code>[thumb]</code> = to reproduce the featured image.</li>
</ul>
autometa’s THUMB is a standalone component of <a href="https://wordpress.org/plugins/autometa/" rel="ugc">autometa</a> shortcodes pack.

autometa's THUMB

It reproduces featured images in pages, posts, portfolios or products simply via: [thumb].

pixelgrade

George Olaru

Andrei Lupu

With <a href="https://github.com/pixelgrade/pixfields" rel="nofollow ugc">PixFields</a> you can have a custom fields visual manager.
Note: this plugin does not add any style to the output of custom fields. Its just adding metadata and offers a way to overwrite the html from the theme. 
The theme should style the output of the metadata.

PixFields

PixFields offers you a nice interface to add custom metadata into your favorite post type.

autometa's THUMB vs PixFields