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.

Stefan Nilsson

By using this plugin you can stop WordPress from automatically creating hyperlinks from links in your visitors comments. There may be several reasons for doing so but the main purpose for my client was to stop all outgoing links he could not control.
Since this plugin only effects your output your visitors links will show up as normal hyperlinks as soon as you deactivate this plugin.
<h3>Donations</h3>
If you like this plugin, feel free to donate a link to <a href="http://www.stefannilsson.com/" title="Stefan Nilsson" rel="nofollow ugc">my blog</a>.
<h3>Feedback</h3>
Please send me your feedback via this <a href="http://www.stefannilsson.com/contact" rel="nofollow ugc">comment form</a>.

Remove Links in Comments

A very simple plugin that prevents Wordpress from automatically creating hyperlinks in the comments section.

Custom Shortlink Structure vs Remove Links in Comments