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.

External Nofollow

etalented

This plugin will solve the problem of manually changing all your external links to open in a new window by doing it automatically for you…for all external links in all posts and pages!
This plugin uses standard HTML and doesn’t introduce any more JavaScript into your already JavaScript heavy WordPress site. It also uses very minimal styling (CSS) to display a new window icon, which is embedded and not externally linked.
The display of the new window icon can be changed in the settings page and you can also add the <code>rel="nofollow"</code> attribute. <a href="https://en.wikipedia.org/wiki/Nofollow" rel="nofollow ugc">Read more about <code>rel="nofollow"</code> on Wikipedia</a>.
Updates to the plugin will be posted on the <a href="https://etalented.co.uk/wordpress-plugin-external-links-to-new-window" rel="nofollow ugc">Etalented website</a> as well as to the <a href="https://en-gb.wordpress.org/plugins/external-links-to-new-window/" rel="nofollow ugc">WordPress.org Plugin Directory</a>.
Originally created by <a href="http://thisismyurl.com" rel="nofollow ugc">Christopher Ross</a> and now authored by <a href="https://etalented.co.uk" rel="nofollow ugc">Etalented</a>.

External Links to New Window

Open all external links in your blog posts and pages automatically in a new tab or new window when clicked or tapped.

External Nofollow vs External Links to New Window