Casey Bisson

This is a convenience class and collection of methods to make creating new custom post types with their own metaboxes easy.
The general idea is to define a function that’s hooked to the <code>register_post_types</code> action. The function defines a class for your post type that extends the <code>GO_Cpt</code> class. This follows a design pattern established by the modern widgets API (as introduced in WP 2.8) https://codex.wordpress.org/Widgets_API#Developing_Widgets .
The result is a new custom post type and much easier creation and updating of custom meta associated with that post type. You’ll also have a convenient object you can use to access the metadata associated with each post.
<pre><code>function my_customposttype() { class My_CustomPostType extends GO_Cpt { function __construct() { // execute the parent constructor with the name 
 // and definition for the custom post type parent::__construct( $post_type_name , $post_type_definition ); } function metabox( $post , $meta ) { // print out the form here // 
 // this method is optional, only use it if you want to 
 // add a metabox to your custom post type } function update( $new_meta , $old_meta ) { // sanitize and validate the metadata // then return $meta so it can be saved // // this method is required if a 
 // metabox() method is included } } global $my_customposttype; $my_customposttype = new My_CustomPostType; } // hook that function to the register_post_types action add_action( 'register_post_types' , 'my_customposttype' ); </code></pre>
Backstory: defining the post type class inside the function avoids issues with loading order and fatal errors resulting from attempting to extend a class that might not exist yet. Isn’t PHP awesome?
See the included hello world example: https://plugins.trac.wordpress.org/browser/go-cptfactory/trunk/example-helloworld-cpt.php
To access the meta associated with a post, you can call <code>$my_customposttype->get_meta( $post_id );</code>
You can easily add a method and hook to filter <code>the_content</code> or <code>the_excerpt</code> to insert custom values that may have been entered in the post meta. Simply add <code>add_filter( 'the_content' , array( $this , 'the_content' ));</code> in the <code>__construct()</code> and then define another method in the <code>My_CustomPostType</code> class such as:`
<pre><code> function the_content( $content ) { 
 $meta_print = print_r( $this->get_meta( get_the_ID() ) , TRUE ); 
 return $meta_print . $content 
 } </code></pre>
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GigaOM Custom Post Type Factory

Makes defining custom post types as easy as creating a widget. Includes example code to get you started.

Apsara Aruna

Alternative CSV Importer plugin. Simple and powerful, best for geeks.
<ul>
<li>Category support</li>
<li>Tag support</li>
<li>Custom field support</li>
<li><a href="https://wordpress.org/plugins/smart-custom-fields/" rel="ugc">Smart Custom Fields</a> support</li>
<li><a href="http://customfieldsuite.com/" rel="nofollow ugc">Custom Field Suite</a> support</li>
<li><a href="http://www.advancedcustomfields.com/" rel="nofollow ugc">Advanced Custom Fields</a> support</li>
<li>Custom Taxonomy support</li>
<li>Custom Post Type support</li>
<li>Filter hook for dry-run-testing</li>
<li>Filter hooks for customize csv data before importing to database</li>
<li>Action hook for update post data after importing to database</li>
</ul>
You can get example CSV files in <code>/wp-content/plugins/simple-csv-importer/sample</code> directory.
<h4>Available column names and values:</h4>
<ul>
<li><code>ID</code> or <code>post_id</code>: (int) post id. 
This value is not required. The post ID is already exists in your blog, importer will update that post data. If the ID is not exists, importer will trying to create a new post with suggested ID.</li>
<li><code>post_author</code>: (login or ID) The user name or user ID number of the author.</li>
<li><code>post_date</code>: (string) The time of publish date.</li>
<li><code>post_content</code>: (string) The full text of the post.</li>
<li><code>post_title</code>: (string) The title of the post.</li>
<li><code>post_excerpt</code>: (string) For all your post excerpt needs.</li>
<li><code>post_status</code>: (‘draft’ or ‘publish’ or ‘pending’ or ‘future’ or ‘private’ or custom registered status) The status of the post. ‘draft’ is default.</li>
<li><code>post_password</code>: (string) The password to protect the post. The password is limited to 20 characters.</li>
<li><code>post_name</code>: (string) The slug of the post.</li>
<li><code>post_parent</code>: (int) The post parent id. Used for page or hierarchical post type.</li>
<li><code>menu_order</code>: (int)</li>
<li><code>post_type</code>: (‘post’ or ‘page’ or any other post type name) (required) The post type slug, not labels.</li>
<li><code>post_thumbnail</code>: (string) The uri or path of the post thumbnail. 
E.g. http://example.com/example.jpg or /path/to/example.jpg</li>
<li><code>post_category</code>: (string, comma separated) slug of post categories</li>
<li><code>post_tags</code>: (string, comma separated) name of post tags</li>
<li><code>tax_{taxonomy}</code>: (string, comma separated) Any field prefixed with <code>tax_</code> will be used as a custom taxonomy. Taxonomy must already exist. Entries are names or slugs of terms.</li>
<li><code>{custom_field_key}</code>: (string) Any other column labels used as custom field</li>
<li><code>cfs_{field_name}</code>: (string) If you would like to import data to custom fields set by Custom Field Suite, please add prefix <code>cfs_</code> to column header name.</li>
<li><code>scf_{field_name}</code>: (string) If you would like to import data to custom fields set by Smart Custom Fields, please add prefix <code>scf_</code> to column header name.</li>
<li><code>comment_status</code>: (‘closed’ or ‘open’) Default is the option ‘default_comment_status’, or ‘closed’.</li>
</ul>
Note: Empty cells in the csv file means “keep it”, not “delete it”. 
Note: To set the page template of a page, use custom field key of <code>_wp_page_template</code>. 
Note: If providing a post_status of ‘future’ you must specify the post_date in order for WordPress to know when to publish your post. 
Note: If the post_type value is <code>attachment</code>, you can use <code>post_thumbnail</code> field to define media URL or path.
<h4>Advanced Custom Fields plugin integrate</h4>
If advanced custom field key is exists, importer will trying to use <a href="http://www.advancedcustomfields.com/resources/functions/update_field/" rel="nofollow ugc">update_field</a> function instead of built-in add_post_meta function. 
How to find advanced custom field key: <a href="http://www.advancedcustomfields.com/resources/functions/update_field/#finding-the%20field%20key" rel="nofollow ugc">Finding the field key</a>

Simple CSV Importer

Alternative CSV Importer plugin. Simple and powerful, best for geeks.

GigaOM Custom Post Type Factory vs Simple CSV Importer