ded.zamkad

<p>WordPress Flickr Embed Plus is a WordPress plugin that provides an interactive interface for adding Flickr images to your posts. The interface is conveniently launched from the visual editor toolbar.</p>
<p>This is a fork of the (https://wordpress.org/plugins/wp-flickr-embed/) plugin for WordPress and provides numerous bug fixes and enhancements over the original.</p>
<h4>New Features</h4>
<ul>
<li>Supports EXIF metadata as label for photo</li>
</ul>
<h4>Features</h4>
<ul>
<li>Search for an select any public photo or a private one from your photostream (requires Flickr authorization).</li>
<li>Sort search results by date taken or date posted</li>
<li>Insert a photo anywhere in your post, choosing its title, size and how it should be aligned to the text.</li>
<li>Link the photo back to its Flickr page or to a different-sized version of itself.</li>
<li>Supports Lightbox and Lightview popups.</li>
</ul>
<p>Source on Github: https://github.com/ded-zamkad/wp-flickr-embed-plus</p>
<p><em>Note:</em> This plugin requires PHP 5.2.</p>


WordPress Flickr Embed Plus

Wordpress Flickr Embed Plus is a Wordpress plugin that provides an interactive interface for adding Flickr images to your posts.

jmarreros

<p>This Plugin allows to use an external image as Featured Image, this can be especially useful if you house your images in another location.</p>
<p>This Plugin is compatible with Nelio External Featured Image Metadata, so you can reuse your data in case you want to uninstall Nelio Plugin.</p>


External URL Featured Image

It is what I was looking for: simplicity.

$external_image = get_post_meta( $post->ID, '_dcms_eufi_img', true );

Works well for me

Use an external url image as Featured Image for your posts, pages, and other kind of post types.

WordPress Flickr Embed Plus vs External URL Featured Image