Arthur Gay

<p>This plugin allows user to know if his username is available while typing. No further need to hit the “submit” button to check username availability. Each times the user types a character in the username textfield, an ajax request is send to a php script which check username availability.</p>
<h3>Credits</h3>
<p>Images by Pixel Mixer – www.pixel-mixer.com</p>


Live username availability checking

A plugin for live username availability checking.

Trân Minh-Quân

<p>This plugin lets you change user’s login username. It changes user_nicename as well so that your author link will correspond to your new username.</p>
<h3>Languages</h3>
<ul>
<li>English</li>
<li>Français</li>
<li>Swedish</li>
<li>Vietnamese</li>
</ul>
<h3>Credits</h3>
<p>Translators:</p>
<ul>
<li>Erik Billerby: Swedish</li>
<li>Igor Oliveira Ferreira: Brazillian Portuguese</li>
</ul>


WPVN – Username Changer

50% of the entire code circles around "level_can_use", i.e., role/level-based authorization, which has been deprecated many moons ago.
Additionally, it only allows to rename your own username.



Outdated & Limited

This plugin lets you change user's login username. It changes user_nicename as well so that your author link will correspond to your new username …

Live username availability checking vs WPVN – Username Changer