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The Custom Field Widget displays values of custom field keys, allowing post- and page-specific meta sidebar content with limitless applications.
Custom Field Widget is for WordPress 2.6.x and features:
<ul>
<li>Multiple widget instances possible</li>
<li>Widget-specific optional title and text</li>
<li>Conditional functionality, i.e., without a matching key, the widget is not displayed</li>
<li>Practically unlimited possible uses</li>
</ul>
<h3>Use</h3>
If you are unfamiliar with custom fields, you should first read about them on the <a href="https://codex.wordpress.org/Using_Custom_Fields" title="Using Custom Fields - WordPress Codex" rel="nofollow ugc">WordPress Codex</a>.
Custom fields are added to posts and pages from the Write > Page and Write > Post menus, just below the main editor area. You may add as many custom fields to a post/page as you like.
There are two separate fields for each custom field: the key and its value. The Custom Field Widget finds a specified key and then displays its corresponding value in the sidebar. Without a matching key, nothing is displayed.
The Custom Field Widget doesn’t necessarily ‘do’ anything, but it enables an advanced (and often overlooked) feature built-in to WordPress. For example, see <a href="http://performancing.com/wordpress-tips/jazz-your-site-28-ways-use-wordpress-custom-fields" title="Jazz Up Your Site: 28 Ways To Use WordPress Custom Fields" rel="nofollow ugc">28 Ways to Use WordPress Custom Fields</a> for a small picture of possibilities.
I developed this plugin for my own use. I wanted to display a small table of contents for certain pages (which are without categories) in the sidebar dynamically. Without a widget, I would have to edit the sidebar file(s) for each theme I used.
Because each table of contents (a short <code>ol</code> of items) varied from page to page, it also had to be specific to each page. So I created a custom field key of <code>toc</code> and added the <code>ol</code> of items to its value. Enabling the plugin, I had a table of contents appear in the sidebar for each page with a custom field key of <code>toc</code>.
The uses and applications of WordPress custom fields are infinite. Just <a href="http://www.google.com/search?q=wordpress+custom+fields" title="Google Search: wordpress custom fields" rel="nofollow ugc">search for WordPress custom fields</a> for thousands of results on this subject.
<h3>License</h3>
Custom Field Widget, a plugin for WordPress, (C) 2008 by Scott Allan Wallick, is licensed under the <a href="http://www.gnu.org/licenses/gpl.html" title="GNU General Public License" rel="nofollow ugc">GNU General Public License</a>.
Custom Field Widget is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
Custom Field Widget is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with Custom Field Widget. If not, see <a href="http://www.gnu.org/licenses/" title="GNU General Public Licenses" rel="nofollow ugc">http://www.gnu.org/licenses/</a>.

Custom Field Widget

The good thing about small and simple plugins, is that they are robust :)

Still works (Wordpress 4.4)

The Custom Field Widget displays values of custom field keys, allowing post- and page-specific meta sidebar content with limitless applications.

peplamb

This wordpress plugin checks for all custom keys in page/post for custom keys ending with _Custom_Field_Cookie and writes that key as cookie and its value as cookie value. A post or a page may have multiple custum keys ending with _Custom_Field_Cookie.
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<ul>
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</ul>

Custom Field Cookie

This plugin checks for all custom keys in page/post ending with _Custom_Field_Cookie, writes key as cookie name & value as cookie value.

Custom Field Widget vs Custom Field Cookie