Not a plugin for the faint of heart for sure (it has no UI and is "all code"), because you've got to know your way around coding things in WP pretty well to get it to work for you. But once you do, this little gem will make adding strong features to your site very simple.
In my case, I needed to add a few extra meta data items to my users. I didn't want to use a plugin "suite" of meta addons because I only needed one or two elements. With Custom Metadata Manager I was able to only add the items I needed, and do so in a very "official" WP feeling sort of way. By that I mean the coding and the functions mesh nicely with WP and make it feel like a system component, not a plugin.
Saves hours of development time.
After adding the call below to an action_menu hook it just worked:
x_add_metadata_field( 'my_new_id', 'user', array('label' => 'my_new_id', 'display_column' => true) );
An admin could then set and maintain the new field in the normal way (select [Users -> All Users] ...).
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