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.

pixelgrade

George Olaru

Andrei Lupu

With <a href="https://github.com/pixelgrade/pixfields" rel="nofollow ugc">PixFields</a> you can have a custom fields visual manager.
Note: this plugin does not add any style to the output of custom fields. Its just adding metadata and offers a way to overwrite the html from the theme. 
The theme should style the output of the metadata.

PixFields

PixFields offers you a nice interface to add custom metadata into your favorite post type.

Fields vs PixFields