Alex

This plugin will add new settings to your Settings -> Permalinks screen for you to 
specify your blog’s shortlink structure. By default WordPress shortlinks look like 
http://yrnxt.com/?p=153. Using this plugin you can specify every other structure 
you like, e.g. <a href="http://yrnxt.com/~153" rel="nofollow ugc">http://yrnxt.com/~153</a>.
Specifying new shortlink structures will never break WordPress’ default. Also when 
changing the shortlink structure again afterwards old structures won’t break until you 
explicitly remove them.
Take a look at the <a href="https://wordpress.org/extend/plugins/custom-shortlink-structure/screenshots/" rel="ugc">screenshots</a>.

Custom Shortlink Structure

Change the default WordPress shortlink structure dynamically just like you can change your permalinks.

Codexpert, Inc

Nazmul Ahsan

Pluggable IO

This simple plugin helps you convert URLs in post content to clickable links. Also, it opens external links in new browser tab automatically.
Just install and activate the plugin, and you’re done. No additional settings are required.
For more, visit <a href="https://pluggable.io/plugin/clickable" rel="nofollow ugc">https://pluggable.io/plugin/clickable</a>

Clickable – Converts URLs to clickable links

Converts URLs in a post content to clickable links

Custom Shortlink Structure vs Clickable – Converts URLs to clickable links