DjZoNe

Have you ever thought about, that putting a post in a category is so plain, and you need more sophisticated settings. Let’s say one post is more relevant to a category, than another one, so you want the more relevant posts to show up first, then the less relevant ones.
Now, it can be done easily, with Category Relevance plugin
<a href="https://downloads.wordpress.org/plugin/category-relevance.1.0.zip" rel="nofollow ugc">Download now!</a>
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Category Relevance

With this plugin, you can set a relevance value of a post against a category.

Marzio Carro

Adds categories and tags functionality for your pages.
This plugin addsthe ‘post_tag’ and the ‘category’ taxonomies, which are the names of the existing taxonomies used for tags and categories the Post type ‘page’.
This enables the categories metabox and the tags metabox in the New or Edit Page interface.
The plugin has no settings, does not alter the database and only uses hooks to 
achieve it’s goal. It works perfectly fine with Multisite installations.
This plugin WILL NOT add any display of categories or tags to your template files.
Plugin’s website: <a href="http://technotes.marziocarro.com/category/wordpress-plugins/" rel="nofollow ugc">http://technotes.marziocarro.com/category/wordpress-plugins/</a>
Author’s website: <a href="http://technotes.marziocarro.com/" rel="nofollow ugc">http://technotes.marziocarro.com/</a>

Category Tag Pages

Wonderful functionality

Yes, it works. Uses very few lines of code and it's a simple and safe solution to have categories and tags in pages.

It works

Adds categories and tags functionality for your pages.

Category Relevance vs Category Tag Pages