LordPretender

<p>This plugin allow you to add files into your media library without having to upload them. So, you will be able to share, for example, your files into your Google Drive.<br />
This also save you steps to download the image to local computer and upload again to your own WordPress.</p>
<h4>Features</h4>
<ul>
<li>Automatically downloads and adds the file to the media library.</li>
<li>After the uploading is successful, you are redirected to the edit screen</li>
<li>A new dropdown list is available in the media library to let you display only uploaded files, not uploaded files, …</li>
</ul>


Add Media from URL

large chunks of code taken from the much better original here:

https://en-au.wordpress.org/plugins/lh-add-media-from-url/

IMO it unethical to use this plugin

A crappy clone of the original

Let you add media files into your media library without having to upload them.

conlabz GmbH

<p>With the WP Bookmarks Plugin by conlabz you can bookmark your favorite websites within WordPress. It adds a custom post type called ‘bookmark’, so you can easily manage your bookmarks as you know it from native posts, like tagging and arranging in categories. You can either add bookmarks via your WordPress Backend or place the provided bookmarklet in your browser’s bookmark bar and add a WP Bookmark right from the website you want to bookmark.</p>
<p>Features:</p>
<ul>
<li>Native use and management, that you know from posts</li>
<li>Tagging Bookmarks</li>
<li>Arranging bookmarks in hierarchical categories</li>
<li>Save your bookmarks as draft</li>
<li>Write a few lines about your bookmark in the description area</li>
<li>Language Support for English and German</li>
</ul>


WP Bookmarks

WP Bookmarks adds a special post type to your WordPress installation, that you can use for bookmarking your favorite websites.

Add Media from URL vs WP Bookmarks