Rectus Inc.

A plugin for convenient tag management. 
When posting, any tags that exist on the page will be automatically registered. 
You can also register or delete tags for all pages at once.

Rectus Auto Tagging

If a tag exists in a page at the time of submission, it is automatically registered. Tags can also be registered or deleted for all pages at once.

alexandrudanfratean

This plugin will auto-describe your post tags or your wordpress categories using freebase.
All you have to do after enabling it is to watch it work!
If you dont see any tag description or category description in your frontend tag/category pages, make sure your wordpress theme is displaying them!

Auto Describe Tags

Using freebase, this plugin will auto describe tags and categories.

Rectus Auto Tagging vs Auto Describe Tags