szehau

Default Trackbacks is a wordpress plugin that sends trackback to the preset URLs. It is enhanced version of the old Default Trackback.
Features:
<ul>
<li>Send trackback to the URLs in the list when a post status is changed from “any” to “publish”.</li>
<li>Configure the trackback URLs under WordPress?s admin setting page.</li>
<li>Default setting for sending trackbacks (to send trackbacks by default or not each time publish a post).</li>
<li>Option to override default setting above at edit/new post page.</li>
</ul>

Default Trackbacks

This plugin will send trackbacks to URLs in the list ONLY when user publish a post or change the post status to publish.

Gabriel Koen

** This plugin now works! ** It broke shortly after I originally uploaded it last year. People are still downloading it, so I decided to make it work. I revamped it and made it totally compatible with the latest version of WordPress.
External Related Posts takes the category, tags or custom taxonomy from your post (or custom post type) and searches Google Blog Search for related posts. External Related Posts then adds a link to that blog to your post and pings them, letting them know you made a relevant post on their subject.
Controls exist for how many blogs to search for, whether to only post links to blogs that accept pingbacks, how many pingbacks to perform, and a randomizer for how often External Related Posts activates (e.g., every post, 50% of your posts, 25% of your posts).
Github: https://github.com/mintindeed/external-related-posts
WordPress.org: https://wordpress.org/extend/plugins/external-related-posts/
Image by <a href="http://www.flickr.com/photos/tobanblack/3773116901/" rel="nofollow ugc">Toban Black</a>; some rights reserved. See link for details.
<h3>Licence</h3>
External Related Posts is released under GPL v2.

External Related Posts

Grabs related links from Google Blog Search, inserts a link to them into your post and gives them a pingback.

Default Trackbacks vs External Related Posts