AcumenConsulting

The Descriptive Menu Widget takes the manual work out of rendering a WordPress menu with menu item descriptions. Built for those experienced with CSS, the generated markup gives you full control over how your menu is displayed, including an optional icon element.

Descriptive Menu Plugin

The Descriptive Menu Widget adds a WordPress menu to a page and includes each menu item's description.

WillerZ

Link Wrench wraps the content of the links (anchor tags) in your blog in a span with class “insidelink”. You can then use CSS to style them.
Development of the plugin is <a href="https://github.com/nomzit-dot-com/link-wrench" title="Link Wrench on github" rel="nofollow ugc">on github</a>.
This plugin is funded by <a href="http://www.strawberrycat.com/" rel="nofollow ugc">StrawberryCat</a>.

Link Wrench

Link Wrench wraps the content of the links (anchor tags) in your blog in a span with class "insidelink".

Descriptive Menu Plugin vs Link Wrench