ThemeShock

<p>Custom 404, helps you customize your 404.<br />
From the dashboard options you’re able to modify the background, the image and the fonts color and style.</p>
<p>This page will show users the last post on your site, so that they may choose to follow one of this instead of leaving your page.</p>
<h3>Features</h3>
<ul>
<li>Customizable background</li>
<li>Several Patterns</li>
<li>Multiple fonts</li>
<li>24 additional images.</li>
<li>5 Different languages</li>
</ul>


Custom 404 Error Page: Unilimited designs and colors

Custom 404, creates a 404 page that is set to the default one of your WordPress installation.
This page is fully customizable from the dashboard.

Aaron Jorbin

arturmoczulski

danielmorell

<p>Rollbar collects errors that happen in your application, notifies you, and analyzes them so you can debug and fix them.<br />
This plugin integrates Rollbar into your WordPress installation.</p>
<h4>Features</h4>
<ul>
<li>PHP & JavaScript error logging.</li>
<li>Define an environment for each single WordPress installation or Multisite blog.</li>
<li>Specify your desired logging level.</li>
<li>Regular updates and improvements!</li>
</ul>
<p><strong>Please note:</strong><br />
In order to use this plugin, a <a href="https://rollbar.com/" rel="nofollow ugc">Rollbar account</a> is required.</p>
<h4>Support</h4>
<ul>
<li>Browse <a href="https://github.com/rollbar/rollbar-php-wordpress/issues" rel="nofollow ugc">issue tracker</a> on GitHub and report new issues.</li>
<li>If you run into any issues, please email us at <a href="mailto:support@rollbar.com" rel="nofollow ugc">support@rollbar.com</a>.</li>
<li>For bug reports, please <a href="https://github.com/rollbar/rollbar-php-wordpress/issues/new" rel="nofollow ugc">open an issue on GitHub</a>.</li>
</ul>
<h4>You like it?</h4>
<p>You can at least support the plugin development and rate it up!</p>
<h4>Disclaimer</h4>
<p>This plugin is a community-driven contribution. All rights reserved to <a href="https://rollbar.com/" rel="nofollow ugc">Rollbar</a>.</p>


Rollbar

Happy to spread my plugin!

rollbar-php version 0.18.0 is now available. (This project is currently using version 0.15.0).
Set this up to track my errors (roller is reasonable free for personal projects). Works great.
Roller says that a new version is available so would be good to see that shipped with this plugin.



Works a treat; but update rollbar-php


Rollbar should update this plugin because it causes PHP deprecation warnings. I emailed them half a year ago, and they still haven't updated it.


Works, but outdated

Official Rollbar full-stack error tracking for WordPress supported by Rollbar, Inc.

Custom 404 Error Page: Unilimited designs and colors vs Rollbar