themifyme

Easily create metaboxes for your posts and custom post types, or for user profiles. 
Please note, this plugin is intended for developers, to see how to use this plugin you can checkout the “example-functions.php” file inside the plugin.
Supported field types
<ul>
<li>textbox: general text input</li>
<li>image: image uploader, allows user to upload images directly or use the WordPress media browser</li>
<li>video: same as “image” but only allows uploading video files</li>
<li>audio: same as “image” but only allows uploading audio files</li>
<li>dropdown: multiple choice select field</li>
<li>radio</li>
<li>checkbox</li>
<li>color: color picker</li>
<li>date: date and time picker, with options to change the formatting of the date</li>
<li>gallery_shortcode: upload and select multiple images</li>
<li>multi: allows displaying multiple fields in the same row</li>
</ul>

Themify Metabox

Metabox creation tool with advanced features.

Tran Ngoc Tuan Anh

eLightUp

The Inspector plugin is a tool for developers, which allows us to see hidden information for debugging. The information includes option value, post meta value, <a href="http://www.deluxeblogtips.com/2012/01/get-admin-screen-information.html" rel="nofollow ugc">current admin screen information</a>, current user information, admin menu items and registered scripts and styles.
Features
<ul>
<li>View/Delete option via Ajax</li>
<li>View/Delete post meta via Ajax</li>
<li>Autocomplte option & post meta name</li>
<li>View current admin screen information</li>
<li>View curren user information</li>
<li>View admin menu items</li>
<li>View registered scripts and styles</li>
</ul>

Inspector

Inpect hidden information of your WordPress websites for debugging

Themify Metabox vs Inspector