TIgor4eg

Plugin shows <a href="http://www.twitter.com" rel="nofollow ugc">twitter</a> links from <a href="http://backtweets.com" rel="nofollow ugc">backtweets.com</a> in widget area.
<a href="http://tigor.org.ua/wp-twitbacks/" rel="nofollow ugc">Russian description</a>
It shows “shortened” links like bit.ly, goo.gl and other link shortering services.
You can configure your widget.

WP Twitter Backlinks

Plugin shows twitter links from backtweets.com in widget area.

Nimrod Flores

Based on the greatly useful (for SEO) but long outdated plugin “Link Juice Keeper”, Backlinks Saver is an updated and simplified version of that SEO plugin. It helps you save the link juice from existing backlinks to non-existent pages on your site by redirecting them to the home page with 301 status code.
If you are optimizing your site for the search engines, you must already know that backlinks are very important and you should make each and every one of them count. But sometimes we make changes to our sites that make some backlinks worthless, changes like:
<ul>
<li>Changing the Permalinks Structure for the whole site</li>
<li>Changing the Permalink of a certain page/post</li>
<li>Deleting a page/post</li>
</ul>
The above changes will lead to backlinks being sent to 404 error pages, which tells the search engine bots that those pages don’t exist on your site anymore, so your backlinks to those pages won’t be counted. But with Backlinks Saver, the links will be sent to the homepage so that they will still count for your domain.
For questions and support, please post them at the <a href="http://nimrodflores.com/backlinks-saver" rel="nofollow ugc">plugin page</a>. I can’t provide quick help if you post your questions in the forum as I am not always in the forums.
Important Note: The redirection will not work if you are using the WordPress default permalinks structure. ie: <code>http://www.yoursite.com/?p=123</code>
Make sure you use any of the other options for permalink structure.

Backlinks Saver

Backlinks Saver helps you save the link juice from existing backlinks to non-existent pages on your site by redirecting them to the home page with 301 …

WP Twitter Backlinks vs Backlinks Saver