Tom Lany

In WordPress 3.0 and later, <a href="https://core.trac.wordpress.org/changeset/14996" rel="nofollow ugc">a default filter</a> changes all instances of “WordPress” (note the small “p”) in posts, titles, and comments to “WordPress”. <a href="https://core.trac.wordpress.org/ticket/13583" rel="nofollow ugc">For various reasons</a>, such as preserving spelling in existing posts and comments, a blog owner may want to turn this filter off. That is what this plugin does.
Simply upload the plugin files to your WordPress plugins folder, activate it on your blog’s Plugin administration page, and you are set!
<h3>Technical Details</h3>
This plugin seeks to disable the capital_P_dangit function, which is the WordPress function that disallows “WordPress” to be used on blogs.
The filter is defined in <a href="https://core.trac.wordpress.org/browser/trunk/src/wp-includes/default-filters.php" rel="nofollow ugc">wp-includes/default-filters.php</a> and is applied in <a href="https://core.trac.wordpress.org/browser/trunk/src/wp-includes/formatting.php" rel="nofollow ugc">wp-includes/formatting.php</a> of the core WordPress code.
The remove_filter function is used in this plugin to undo the add_filter function applied in wp-includes/formatting.php. In versions 1.0 and 1.1 of this plugin, the function was removed for certain priority levels. As of version 1.2, this plugin removes the filter for all possible priority levels. Thanks to <a href="http://subscribe2.wordpress.com/" rel="nofollow ugc">Matt Robinson</a> for suggesting this method and providing code that is used in the plugin.
For more information regarding how this function is applied in WordPress, the following are the relevant changesets to the core WordPress code regarding this function:
<ul>
<li><a href="https://core.trac.wordpress.org/changeset/14996/" rel="nofollow ugc">Changes made for WordPress 3.0</a></li>
<li><a href="https://core.trac.wordpress.org/changeset/15377/" rel="nofollow ugc">Changes made for WordPress 3.0.1</a></li>
<li><a href="https://core.trac.wordpress.org/changeset/15877/" rel="nofollow ugc">Changes made for WordPress 3.1</a></li>
<li><a href="https://core.trac.wordpress.org/changeset/21242/" rel="nofollow ugc">Changes made for WordPress 3.5</a></li>
<li><a href="https://core.trac.wordpress.org/changeset/25093/" rel="nofollow ugc">Changes made for WordPress 3.7</a></li>
<li><a href="https://core.trac.wordpress.org/changeset/26122/" rel="nofollow ugc">Changes made for WordPress 3.8</a></li>
</ul>

Remove WordPress to WordPress filter

Brilliant

This turns off the default filter that changes all instances of "Wordpress" to "WordPress".

Philip Newcomer

Sometimes developers need to filter the output of a widget that does not have its own output filter built-in. This plugin provides a filter which will allow developers to filter any widget’s output, regardless of whether it has that capability natively or not.
This plugin was inspired by a similar filter in the <a href="https://wordpress.org/plugins/widget-logic/" rel="ugc">Widget Logic</a> plugin, and essentially duplicates that functionality, but with more flexibility.
Usage instructions are <a href="https://github.com/philipnewcomer/widget-output-filters" rel="nofollow ugc">on GitHub</a>.
This plugin is developed <a href="https://github.com/philipnewcomer/widget-output-filters" rel="nofollow ugc">on GitHub</a>, and is available as a <a href="https://packagist.org/packages/philipnewcomer/wp-widget-output-filters" rel="nofollow ugc">Composer package</a>.

Widget Output Filters

A library which enables developers to filter the output of any WordPress widget.

Remove WordPress to WordPress filter vs Widget Output Filters