vlad.olaru

pixelgrade

George Olaru

Razvan Onofrei

Andrei Lupu

cristianfrumusanu

With <a href="https://github.com/pixelgrade/pixtypes" rel="nofollow ugc">PixTypes</a> you can allow your theme to define what custom post types or meta-boxes should be active when your theme is up
Note: This plugin is addressed to developers, it doesn’t do nothing if it isn’t <a href="https://github.com/pixelgrade/pixtypes#pixytpes_config" rel="nofollow ugc">properly configured</a>.

PixTypes

Theme-driven post types, taxonomies & custom fields.

Amaury Balmer

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.

PixTypes vs Relations Post Types