John LeBlanc

Assigns tags to posts containing specific text strings, handy for filtering within the loop. A gift to <a href="http://twitter.com/docrock/status/58054643929985024" rel="nofollow ugc">@docrock</a> from <a href="http://twitter.com/johnleblanc/status/58303307713753088" rel="nofollow ugc">@johnleblanc</a> to help keep <a href="http://instagr.am/" rel="nofollow ugc">Instagr.am</a> image posts out of the <a href="http://www.mrdocrock.com" rel="nofollow ugc">mrdocrock.com</a> homepage loop. Born April 13, 2011 in <a href="http://maps.google.com/maps?ll=21.408966,-157.831993&spn=0.091894,0.162907&t=h&z=13&lci=com.panoramio.all,com.youtube.all,com.google.webcams,org.wikipedia.en" rel="nofollow ugc">Kaneohe, HI</a>.

Doc’s Auto-tags

Assigns tags and/or categories to posts containing specific text strings, handy for filtering within the loop.

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.

Doc’s Auto-tags vs Category Tag Pages