The Bookmarklet WordPress plug-in gives you the ability to add social media sharing options to the Posts and Pages of your website.
Broken Link Checker - allow users to check and fix broken links entire website includes your posts, comments and missing images.
Converts bare image links inserted in the post content by the user into HTML tagged images, so turns links into visible images.
Adds a sidebar widget to submit links to blogroll
Embed any external content on a Page, Post, or Custom Post Type without the need to use complicated domain forwarding or domain masks.
LinkTexting let's you install a text-to-download widget for your wordpress site
Link Icons adds an icon next you your different types of links in your posts an pages
You can use the tags which are defined by the WordPress as mentioned here. Also, you can use the tags which are customily defined by this plugin for PostTypes and Taxonomies. You can also find these tags in Permalinks Customizer menu on WordPress Dashboard (if the plugin is installed).
Simple Twitter Link displays a link allowing Twitter users to update their status with a link back to your post or page.
Simple Buzz Link displays a link allowing people to bookmark a post/page on Google Buzz.
This is a plugin to provide a rainbow effect on the current link on hover
This plugin helps you check, organize and monitor your broken backlink.
Wordpress ALIYUN
This plugin is designed to integrate a WordPress site with the Receive Links Link Exchange Network with little work on the users part.
This plugin is designed to integrate a WordPress site with the SEO link eXchange network.