Alex King

Crowd Favorite

A flexible shortcode and lookup tool for creating internal links in post/page content (or anywhere shortcodes are parsed). 
A lookup tool is added to the sidebar of the post edit screen for locating shortcodes for internal posts.
A plugin by <a href="http://crowdfavorite.com" rel="nofollow ugc">Crowd Favorite</a>. We build Big Things with WordPress.

CF Internal Link Shortcode

A flexible shortcode and lookup tool for creating internal links in post/page content (or anywhere shortcodes are parsed).

Kevin Leary

Automatically link keywords and phrases to pages within a website. For example, you can make the phase “wordpress cms” automatically link to the page yoursite.com/wordpress-cms/. This is a good practice to follow for SEO, and also has the added advantage of decreasing your website’s bounce rate.

Internal Link Manager

Easily manage automated internal links throughout your website.

CF Internal Link Shortcode vs Internal Link Manager