This plugin add “External Link” section to your editor.
If your posts are used as news in your site, sometimes a post is titled simply “Our service is promoted in famous web magazine” and just having a single link to PR site.
This plugin will add a meta box to save metadata below:
If you set external link, the_permalink will be replaced with it. The link in your widget, post archive, and so on will refer to the URL you saved.