Amaury Balmer

WordPress 3.1 and up allow to manage new custom post type, this plugin makes it even simpler, removing the need for you to write any code. Excerpt update your theme !
This plugin provides a nice interface and easy access. The plugin provides almost all the parameters of the WordPress CPT API.
It’s possible to manage the permissions of custom post types such as articles or pages. Or create a full set of custom permissions and related roles !
This plugin is developped on WordPress 3.3, with the constant WP_DEBUG to TRUE.

Simple Custom Post Types

WordPress 3.1 and up allow to manage new custom post type, this plugin makes it even simpler, removing the need for you to write any code.

Nicolas Juen

This plugin allow to build relation between 2 custom types (posts, page, custom), very useful for manage related content on CMS type website.
A few example use cases:
<ul>
<li>manually lists of related posts</li>
<li>post series</li>
<li>rented houses connected to agency</li>
<li>etc.</li>
</ul>
Relationships are created from a settings page from the administration console.
This plugin can not do relationships with users, you should test this excellent plugin made by scribu 
https://wordpress.org/extend/plugins/posts-to-posts/

Relations Post Types

This plugin allow to build relation between 2 custom types (posts, page, custom), very useful for manage related content on CMS type website.

Simple Custom Post Types vs Relations Post Types