Link Away is a simple WordPress plugin that makes it easy to create posts that, instead of linking to the post page, will link to any URL you choose.

This is handy if you want to share an article in your blog feed that sits on another site, but you don't want users to have to go from your blog page to the post page then click the link to the article. This plugin skips the middle step.

Link Away options settings box that appears on post edit pages

Link Away is free and available in the WordPress Plugin Repository.