These plugins help deal with WordPress Taxonomies.
Moves posts from one taxonomy to another.
If you would like to limit Categories or custom taxonomies to one per post, this plugin does it by changing the checkboxes to radio buttons. Simple and just works!
Kind of a narrow use case, but came in really handy for me on a project. Allows you to switch a bunch of taxonomy terms from one taxonomy to another. Hasn’t been updated in a while, unfortunately.
Please leave your questions or comments below! – Brian