Khanh

(Beta) An extension of Fields, a custom field management plugin. PostLinks provides additional field types such as Series, PhotoLink and PostLink.
Three new field types:
<ul>
<li>PostSeries: link your posts into series and display them with the [series] shortcode, also it comes with 2 widgets</li>
<li>PhotoLink: to be added</li>
<li>PostLink: to be added</li>
</ul>

PostLinks

(Beta) An extension of Fields, a custom field management plugin. PostLinks provides additional field types such as Series, PhotoLink and PostLink.

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.

PostLinks vs NextGEN Custom Fields