conlabz GmbH

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.
Features:
<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.

Matthias Pfefferle

Adds OExchange and Web Intents support to WordPress’ “Press This” bookmarklet (http://oexchange.org).
Supported Plugins:
<ul>
<li>the webfinger-plugin: <a href="https://wordpress.org/plugins/webfinger/" rel="ugc">https://wordpress.org/plugins/webfinger/</a></li>
<li>the host-meta-plugin: <a href="https://wordpress.org/plugins/host-meta/" rel="ugc">https://wordpress.org/plugins/host-meta/</a></li>
</ul>
From the website:
<blockquote>
This’ll help you get up and running, whether you’re a service that can accept content, a site that has content to share, or a tool of some sort. Remember that OExchange isn’t limited to “sharing” things; it applies to any case where one service wants to send URL-based content to another — microblogging, translating, printing, whatever.
</blockquote>

OExchange

Adds OExchange and Web Intents support to WordPress

WP Bookmarks vs OExchange