Mark Jaquith

<ol>
<li>Check a category.</li>
<li>Uncheck “Uncategorized”.</li>
<li>Mutter “stupid ‘Uncategorized'” under your breath.</li>
</ol>
Sound familiar? With this stupidly simple plugin, you just have to do the first step. When you check a category and the default category was the only thing checked before you clicked, it’ll uncheck the default category for you. Boom.

Categorized

Unchecks the default post category when you first select a non-default category

grpsmglr00

This plugin builds on the Category Page plugin making it possible to automatically insert posts into pages and subpages based on categories. You must have a current version of <a href="https://wordpress.org/extend/plugins/page2cat/" rel="ugc">Category Page</a> installed in order to function. 
. 
Visit plugin page <a href="http://categorypageextender.wordpress.com/" rel="nofollow ugc">here</a>
<h3>Usage</h3>
To view complete instructions <a href="http://categorypageextender.wordpress.com" rel="nofollow ugc">read here</a>
Open up page.php in your template folder (you may also set up a seperate a Page Template)
For the most basic setup, insert the following below the loop statement in the page.php file:
<pre><?php if( function_exists(page2cat_pages)){ page2cat_pages($post->ID);} ?></pre>

I recommend you wrap the function in your standard post class. For example:
<pre><div class="post">
<?php if( function_exists(page2cat_pages)){ page2cat_pages($post->ID);} ?>
</div></pre>

Plugin Options
<pre><code><?php if( function_exists(page2cat_pages)){ page2cat_pages($post->ID, posts per page, number of pages);} ?> 
</code></pre>
Posts per page: (default = 10) set to 0 to show all 
This sets the number of posts to show at one time on the page.
Number of pages: (default = 15) set to 0 to show all 
This tells how many page numbers to show at a time on the page navigation bar.
Example of Category Page Extender with variables:
<pre><?php if( function_exists(page2cat_pages)){ page2cat_pages($post->ID, 5, 10);} ?></pre>
This will list 5 posts and up to 10 page numbers at a time on the page navigation bar.
<a href="http://categorypageextender.wordpress.com/" rel="nofollow ugc">Plugin Homepage</a>

Category Page Extender

Inserts posts into pages corresponding to category.  Add on plugin for Category Page by pixline.net. Requieres an active installation of Category Page …

Categorized vs Category Page Extender