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".

gobanana

This plugin will output a list of your chosen categories and filter the posts on the fly using jQuery animation.
The setting pages allows you to select which categories should appear, whether or not to include jQuery (if you don’t already have it in the ) and a place to define the posts container. This should be either the class or id of the div that contains all the posts for filtering.
I am open to suggestions to improve the plugin !
<h3>Plugin Site</h3>
http://gobanana.ca/wp-filters

WP-Filters

A live post filtering plugin. Choose which categories to show in the filter and watch the post show/hide without reloading.

Remove WordPress to WordPress filter vs WP-Filters