dalziel

Provides the ability to have a bookmarklet on your browser that will let you add any page as a link on your blog. 
Replaces the functionality of the Add Link bookmarklet that was removed in WordPress 2.5. For more information 
on what a bookmarklet is and how to use them see <a href="http://www.bookmarklets.com/" rel="nofollow ugc">bookmarklets.com</a>

Link This Bookmarklet

Provides the ability to have a bookmarklet on your browser that will let you add any page as a link on your blog.

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

Link This Bookmarklet vs OExchange