randyhoyt

This plugin provides a number of helpers functions to aid in the creation of subordinate relationships between two post types, one-to-many relationships in which posts of one type are children of another. (For example, a Job Listing might have a Company as a parent; a Meeting might have a Group.) With this plugin activated, developers can easily write code in their plugins and themes to register two post types related in this manner.
For an example on how to use the functions this plugin makes available, check out my Groups and Meetings plugin on Github:
<ul>
<li>https://github.com/randyhoyt/mythsoc-groups</li>
</ul>

Subordinate Post Type Helpers

This plugin provides a number of helpers functions to aid in the creation of subordinate relationships between two post types.

aThemes

vladff

The Sydney Toolbox plugin is meant to be used only with the Sydney WordPress theme.
This plugin registers custom post types and custom fields that are needed in the <a href="https://wordpress.org/themes/sydney/" rel="ugc">Sydney theme</a>

Sydney Toolbox

Registers custom post types and custom fields for the Sydney theme

Subordinate Post Type Helpers vs Sydney Toolbox