Bernhard Riedl

This plugin is a <a href="https://www.bernhard-riedl.com/2010/08/01/tagpages-tags-functionality-for-pages-in-wordpress-30/" rel="nofollow ugc">follow-up</a> to the post which I wrote <a href="https://www.bernhard-riedl.com/2007/10/06/wordpress-23-tagging-posts-and-pages/" rel="nofollow ugc">a few years ago</a>. – The idea was (and still is) to equip pages with <a href="https://en.support.wordpress.com/posts/tags/" rel="nofollow ugc">tags</a> and include their number in a combined posts and pages <a href="https://codex.wordpress.org/Function_Reference/wp_tag_cloud" rel="nofollow ugc">tag-cloud</a>.
TagPages is fully compatible with <a href="https://codex.wordpress.org/Administration_Over_SSL" rel="nofollow ugc">https/SSL/TLS-sites</a> and WordPress multisite network.
Plugin’s website: <a href="https://www.bernhard-riedl.com/projects/" rel="nofollow ugc">https://www.bernhard-riedl.com/projects/</a>
Author’s website: <a href="https://www.bernhard-riedl.com/" rel="nofollow ugc">https://www.bernhard-riedl.com/</a>

TagPages

jaric

Basing on WordPress Plugin “tagthepress” .It using for tag suggestions by Yahoo cas API 
http://tw.developer.yahoo.com/cas/
With this plugin, you will be able to use the the Web service for your posts. Just click on <code>Fetch tags</code> and the title, content and optional excerpt of your post will be analyzed by Yahoo cas API in order to find words that could be useful as tags.
It currently works with English, Chinese

AutoTags

Basing on Wordpress Plugin "tagthepress" .It using for tag suggestions by Yahoo cas API

TagPages vs AutoTags