Pat Hawks

dirtysuds

You can use this to show posts from other sites on your homepage and in your archives alongside your own sites posts. 
After you activate the plugin, any post with the post type “Link” will redirect to the first link in that posts content.

Offsite Post

Lopo Lencastre de Almeida

Automatically add links to your favorite social bookmarking site on your posts, pages and in your RSS feed. WordPress 2.6 or above and Sociable 3.4.1 or above is required, if you use an older version of those, please upgrade.
More info:
<ul>
<li>More info on <a href="http://yoast.com/wordpress/sociable/" rel="nofollow ugc">Sociable</a>, with info on how to add sites to it, and how to integrate it into your WordPress in other ways.</li>
<li>Check out the other <a href="https://wordpress.org/extend/plugins/profile/ipublicis" rel="ugc">WordPress plugins</a> by the same author.</li>
<li>Also at <a href="http://box.net/iPublicis4Wordpress" rel="nofollow ugc">iPublicis4Wordpress</a>.</li>
</ul>

DoMelhor for Sociable

Automatically add links on your posts, pages and RSS feed to your favorite social bookmarking sites. Requires Sociable 3.4.1 or above.

Offsite Post vs DoMelhor for Sociable