Robert Wetzlmayr

<p>Smartify your post and page slugs and let them convey the very essence of your content’s titles by removing too short or insignificant stopwords – automatically, that is. <strong>Smart Slug</strong> comes preloaded with an easily expandable and configurable set of German, Dutch, Russian, Portuguese and English stopwords.</p>
<p>Please visit my <a href="http://talkpress.de/blip/wet-smartslug-wordpress-plugin" rel="nofollow ugc">Smart WordPress Slug Plugin</a> article to review additional screenshots, grasp implementation details and contribute to a related discussion on how search engines evaluate words in URL fragments.</p>
<h4>Credits</h4>
<ul>
<li>Russian translation by <a href="http://www.luxpar.de/" rel="nofollow ugc">Natalya Pastukhova</a></li>
<li>Ukrainian translation by <a href="http://www.pastukhova-floeder.de/" rel="nofollow ugc">Natalya Pastukhova</a></li>
<li>Dutch translation by <a href="http://www.patriciaritsemavaneck.name/" rel="nofollow ugc">Patricia Ritsema van Eck</a></li>
<li>Portuguese translation by <a href="http://www.centralwordpress.com.br/" rel="nofollow ugc">Raoni Del Pérsio</a></li>
<li>Hindi translation by <a href="http://outshinesolutions.com/" rel="nofollow ugc">Outshine Solutions</a></li>
<li>Indonesian translation by <a href="http://www.syamsulalam.net/" rel="nofollow ugc">Syamsul Alam</a></li>
<li>Serbian translation by <a href="http://firstsiteguide.com/" rel="nofollow ugc">Ogi Djuraskovic</a></li>
</ul>
<h4>Limitations</h4>
<ul>
<li>Smart Slug overrides all manual slug modifications which would violate its rule set, even if you are making them deliberately.</li>
<li>WordPress appends a unique number to ambigous slugs (e.g. hello-word, hello-world-2 et cetera). Smart Slug may not notice this behaviour when an article is saved for the first time. If this happens you may simply re-save the post to attach a smart slug.</li>
</ul>


Smart Slug

Smartify your post and page slugs by removing too short or insignificant stopwords automatically.

Konstantin Obenland

<p>This plugin replaces the author slug with a sanitized version of the user’s display name.</p>
<p>This plugin will not prevent hackers from finding out your login name but the login name won’t be visible<br />
in the author archive’s URL, which works towards your friendly URLs with using your display name.</p>
<p>DO NOT use this on a site with more than 1000 registered users, as updating all of their nicenames at once might break your site.</p>


WP Author Slug

Easy way to add some obscurity to login guessing.

But please update as it's over 2 years now.

Excellent

This plugin would probably work OK if you have a small number of users (e.g. if your site doesn't allow public login). But if you have a large number of users (e.g. if you are running ecommerce or allow users to register for other reasons), this plugin will probably take down your site.

The reason is that there are hooks that run when you activate or delete the plugin. It runs database fetch and update queries on every user in your database, all in-line on the request (rather than background via a cron). So if you have a thousand or more users it attempts to do a thousand or more database writes when you click Activate or Delete from the plugins list. This will likely grind your website to a halt. 

It would be better/useable if you could either choose to only apply these scripts to specific user types (e.g. Author) or if you could run the update in batches in the background.

Don't use if you have a large user database

Add a layer of security and prevent your login name from being shown in the author archive's URL.

Smart Slug vs WP Author Slug