Khanh

Fields is a WordPress plugin that let you manage write panels in your write/edit page. Fields supports post types that can have UIs.
With Fields, you can define boxes which appear in your write panels. A box can contain a number of groups which are sets of custom fields that you can define. Boxes are displayed as meta boxes and groups are shown as tabs that can be switched inside boxes. Within a group, fields can be shown as either textfields, textarea, drop boxes, radio group or check boxes.
Fields does not create custom post types, to do so, use other plugins such as WP Post Type UI.
Brief structure of Fields:
<ul>
<li>Fields can be: textfield, textarea, select (drop box), radio group and check boxes</li>
<li>A group contains fields</li>
<li>A box contains groups</li>
<li>You can choose which groups a box should include and which post types a box should appear in</li>
</ul>

Fields

Creates custom write panels to manage post custom fields.

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.

Fields vs NextGEN Custom Fields