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Common Links allows you to add regularly used links to the search results when linking text content of your post.
Add your common links from the Tools menu. Then, when linking content, begin typing the link title or URL to pull up and insert the link.
Note: Entering <code>.</code> when querying links will not return results. Use spaces instead to match URLs.

Common Links

Adds custom links to the editor's link query

Tran Ngoc Tuan Anh

This plugin adds rel=”nofollow” to all external links in post content. So, your flow of PageRank can not run to other websites and your blog’s SEO is improved.
The internal links are unchanged.
Requires PHP5.

Common Links vs External Nofollow