Darshan Sawardekar

This plugin adds an <code>[xkcd]</code> shortcode tag to WordPress. You can use it to embed the <a href="http://xkcd.com" rel="nofollow ugc">XKCD</a> webcomic into your posts and pages.
It takes a <code>num</code> attribute that specifies the number of the XKCD comic to embed. For Eg:- To embed the 100th comic use,
<pre><code> [xkcd num='100'] </code></pre>
When the <code>num</code> attribute is omitted the latest XKCD comic is shown instead.
<pre><code> [xkcd] </code></pre>

xkcd-shortcode

Adds an [xkcd] shortcode that loads the XKCD webcomic by number.

cubecolour

This plugin replaces WordPress’s default strong password generator with one to create passwords in a style similar to those described in the <a href="https://xkcd.com/936/" title="XKCD Password Strength comic" rel="nofollow ugc">XKCD Password Strength comic</a>.
The XKCD style passwords are generated on the Add New User and Your Profile Admin pages.
The plugin will generate four word passwords using words of up to seven letters with dashes between the words.
This plugin works on UNIX-based servers (including Linux & MacOS). The words are randomly selected from the operating system’s dictionary list of over 235000 words. As Windows servers do not contain this file, the plugin will have no effect on a Windows server.
In additon to the features of the free plugin, there is an advanced version available from cubecolour called <a href="http://cubecolour.co.uk/downloads/correct-horse-battery-staple-plus/" title="http://cubecolour.co.uk/downloads/correct-horse-battery-staple-plus/" rel="nofollow ugc">Correct Horse Battery Staple Plus</a> which adds the following capabilities and features:
<ul>
<li>Use for self-registered users (single site and multisite)</li>
<li>Use for Password resets</li>
<li>Choice of different number of words in the password</li>
<li>Append a numerical suffix to the password</li>
<li>Option for one of the password words to be all uppercase</li>
</ul>

Correct Horse Battery Staple

Generates new user passwords in a style similar to those described in the 'password Strength' XKCD comic.

xkcd-shortcode vs Correct Horse Battery Staple