Noby

The “Meta Functions Shortcode” Plugin installs the Shortcode ‘meta’. With it you can access the custom fields of your articles by a simple shortcode.
Shortcode Syntax: <code>[meta func="" name="" alt=""]</code>
The shortcode has three functions yet:
<ol>
<li>func=”url” 
 Displays a link using your custom field in “name” as the link target and “alt” as the caption. If “alt” is empty the link target is used as the caption.</li>
<li>func=”plain” 
 Simply displays the custom field in “name” as plain text. If the field is empty it displays the text in “alt”.</li>
<li>func=”img” 
 Inserts the image at the url in your custom field “name” into the article. The “alt” argument is used as the images alternative text attribute.</li>
<li>More functions in later versions of the plugin… Or extend the plugin on your own. See Extending the Plugin (under Other Notes) for details.</li>
</ol>
<h4>Example</h4>
<pre><code>[meta func="url" name="download_url" alt="Download here"]
</code></pre>
This little code in your article displays a link using your custom field “download_url” as the link target and “Download here” as the caption. If you leave the “alt” argument empty then it uses the link target as the caption.
The resulting html code is:
<pre><code><a href='{download_url}'>{alt}</a>
</code></pre>
<h3>Extending the Shortcode</h3>
<h4>Method 1: Hardcoded</h4>
You can extend the plugin by adding the PHP function
<pre><code>function meta_functions_shortcode_{func}($meta, $alt="") {
 return "your desired text or generated html content";
}
</code></pre>
by writing your own plugin file with the function in it. Be sure to replace {func} with your desired function name (will result in the parameter “func” in the shortcode). $meta will be the value of the custom field and $alt the “alt” parameter.
The function should return the text by which the shortcode will be replaced. For example the “_plain” function simply returns $meta or $alt if $meta is empty.
<h4>Method 2: In the admin panel</h4>
This method is more convenient. You can add new functions in the admin panel. For this go to the options page called “Meta Functions Shortcode”. 
Here you can enter a new function name, specify parameter names and set the output html code with the parameters.
Example:
<ul>
<li>Function Name: link</li>
<li>Function Parameter Names: link_url, link_caption</li>
<li>Function Result Code: <code><a href='{link_url}'>{link_caption}</a></code> </li>
</ul>
If you now enter the shortcode [meta func=”link” link_url=”download_url” link_caption=”download_caption”] then in the article/page 
it will be replaced by <code><a href='contents of custom field download_url'>contents of custom field download_caption</a></code>.

Meta Functions Shortcode

The “Meta Functions Shortcode” Plugin installs the Shortcode ‘meta’. With it you can access the custom fields of your articles by a shortcode.

Alex Prokopenko / JustCoded

Just Custom Fields adds ability to extend your Posts, Pages (and other custom post types) and Taxonomies with additional fields. After installation, you will see a simple settings page, which is self-explanatory to use. 
We use the standard WordPress PostMeta API and TaxonomyMeta API to save fields data, so you can use standard WordPress functions in your themes/plugins to get data.
IMPORTANT We do not recommend update plugins on your existing sites from version 2.* to version 3.0+. 
JCF v3.0+ is not compatible with versions 2.*, so some field settings can be lost (and as a result – wrong values on post edit pages).
Plugin supports such field types:
<ul>
<li>Input text</li>
<li>Select Box</li>
<li>Multiple Select Box</li>
<li>Checkbox (single and multiple)</li>
<li>Textarea (you can use WordPress editor too)</li>
<li>Datepicker</li>
<li>Simple Media (files and images upload)</li>
<li>Table</li>
<li>Fields Collection (repeatable fields groups)</li>
<li>Related Content (to set a relation to another Post/Page or Custom Post Type)</li>
</ul>
You can read full documentation on our site: http://justcustomfields.com.
For quick demo you can watch our presentation video: 
https://www.youtube.com/watch?v=7KJeH2d_v48
Starting from v2.0 we have different options to save plugin configuration:
<ul>
<li>Ability to set Fields Settings global if you have MultiSite. So you can set them once, without copying all settings to every new site.</li>
<li>Ability to save Fields Settings to a file system (inside theme or wp-content folder). We expect this option will be popular among the developers. It will be much easier to move your fields’ settings between site versions (dev/production).</li>
</ul>
Starting from v2.2:
<ul>
<li>Simple Media field is now a single file only (before it was multiple). It uses new media upload box from WordPress and saves post thumbnail ID (before it was just a file url). So now you can use the get_the_post_thumbnail() function to work with attachments.</li>
<li>All fields now have “Shortcodes” and hints how to use them inside the templates for non-professional developers.</li>
</ul>
For easy migrations between different sites, we have Export/Import options.
FEEL FREE TO CONTACT ME IF YOU FIND ANY BUGS/ISSUES!
ISSUES TRACKER 
Plugin code is open source and placed in the GitHub public repository. I listed known bugs and future features there. You can post new bugs or feature requests for me there. 
https://github.com/aprokopenko/justcustomfields/issues

Just Custom Fields

Turn WordPress into more powerful CMS by adding advanced and easy to use custom fields

Meta Functions Shortcode vs Just Custom Fields