Bradley Taylor

This plugin disables the custom fields metabox that WordPress includes by default. The custom fields metabox includes a slow query, which on large sites can take 10+ seconds.
Do not install this plugin if you rely on the custom fields metabox. If you do not know what this means you should probably not install this plugin. If you are using a plugin such as Advanced Custom Fields, Custom Field Suite or similar to manage your custom fields don’t worry – these plugins will be unaffected.
The custom fields metabox performance is currently being discussed in <a href="https://core.trac.wordpress.org/ticket/33885" rel="nofollow ugc">Trac</a>. If you find this plugin useful you may want to follow that ticket.

Remove custom fields metabox

Remove the custom fields metabox to improve performance.

shauno

Firsh

This plugin was developed to add custom fields to the excellent and popular NextGEN Gallery plugin. Simply enter the name of your new field(s), select between “input”, “textarea” or “dropdown”, and the field(s) will be automatically added to the “Manage Gallery” screens in the NGG dashboard.
Please note, you do need to add a small tag to the NGG templates to get your custom fields showing in your theme, so please do read the FAQ.
<h3>Quick note on NextGEN Gallery version >= 3.5.0</h3>
This plugin has been working untouched for about 10 years as of the beginning of 2024. But an update to NextGEN Gallery >= 3.50 broke some functionality. Thankfully it was a small 
fix to add support, so I have pushed version 1.2.5 with that support.

NextGEN Custom Fields

very usefull

Creates the ability to quickly and easily add custom fields to NextGEN Galleries and Images.

Remove custom fields metabox vs NextGEN Custom Fields