Boone Gorges

This plugin adds a widget to your WPMU blog that allows the blog administrator to display a list of links from any blog on the installation. Imagine, for instance, that Josie is teaching a class in which she and each of her students have individual blogs. Josie’s got a list of important links (a class blogroll, or maybe links that are relevant to the class), and she’d like to share the links with her students. Using this plugin, her students can place a widget on their blogs that automatically pulls in a certain category of links from her blog.
At the moment, the plugin works like this: Drop the Shared Blogroll widget into one of your blog’s sidebars. You’ll need to know the blog_id of the blog from which you’ll be pulling the links. (This is the big weakness in the plugin for now. For the moment, I’ll probably add a line of code to the Dashboard that echoes the global $blog_id, so that blog owners will know their blog_id and be able to pass it along to other who want to share their links. In the future I may add autocomplete or something. If you have a suggestion, let me know.) Once you’ve entered the source blog id, the plugin automatically populates the Category dropdown list with the categories from the source blog, so if you only want to include one of the link categories you can. You can have as many shared blogroll widgets on a blog as you’d like.

Shared Blogroll

Creates a widget that pulls a category of links from any other blog on the same WPMU installation

Enej Bajgorić

ctlt-dev

ubcdev

Aleksandar Arsovski

This plugin allows users to display their WordPress links by category through custom fields.
The following gives a step-by-step setup overview:
<ol>
<li>Enable the plugin (check the installation tab)</li>
<li>Go to the page/post where you’d like to place your links/blogroll</li>
<li>Make sure that Custom Fields are visible (on the edit page or post page click on the “Screen Options” in the top right and make sure “Custom Fields” is checked off)</li>
<li>Under CUstom fields click on the enter new link</li>
<li>Enter an ID in the “Name” field – the plugin uses the ID “display_links” as a default</li>
<li>Enter the category name of the links you’d like to display in the “Value” field</li>
<li>Click on the “Add Custom Field” button</li>
<li>Enter the following shortcode into the post content area or the widget area you prefer: <code>[links_by_cat field_id="(ID previously entered in Name field goes here)"]</code>
<ul>
<li>Note that if you used “display_links” in the Name field, you do not need to enter the “field_id” parameter in the shortcode and can simply do: <code>[links_by_cat]</code></li>
</ul>
</li>
</ol>
The shortcode also supports many other parameters for ordering and structuring your links. All parameters on the list (except “category”) found on the following page are available: https://codex.wordpress.org/Template_Tags/wp_list_bookmarks#Parameters
Other parameter example:
<pre><code>[links_by_cat orderby="rating"] -- This is an example using the orderby parameter from the list. The links will now be ordered by their rating.
</code></pre>
<h4>Added in 1.0.1:</h4>
The ability to display all categories has been added to the shortcode. Simply add: 
 [links_by_cat display_all]
Many bug fixes have also been introduced in version 1.0.1 as well, so please upgrade.
Currently, only one category is supported per Custom Field entry; however, I am looking to update the plugin soon so that it supports multiple categories.

Display Links by Category

A simple shortcode plugin for displaying links by category through custom fields.

Shared Blogroll vs Display Links by Category