MaikelM

Manage and display links on a WordPress site. Plugin uses custom types, so exporting is very easy. 
To display links in a post or page use the following short tags:
[links cat=”name of category”]
[SHOWLINKS] for displaying all links
A simple option to export links per category is possible using the overview screen: 
Click “All Link Items” -> Click on the link Category you want to export -> [OPTIONAL, but recommended] Select “Title” to alphabetize your export list -> Select “Bulk actions” and chose the Export to xHTML -> Click “Apply” Now you can save you selection. Use pandoc.org to convert your selection to markdown or another format if needed.
This Plugin has a “broken link” check functionality. 
The Broken checks can take a while with a significant number of links. The screen stays blanc during progress. note: No progress bar is shown.
See https://www.bm-support.org/innovation-links/ for a live demo.
How does it work? 
This module makes use of Custom Post Types with non hierarchical catalogue option. So you can give links one or multiple tags. 
Tags works great for retrieving or exporting only certain types of links. 
If all tags for a link are deleted, the link still exist. This is default WP functionality. Since this plugin in built on using default wordpress hooks, 
exporting and importing links can be done used as with post or pages.

Simple Link Library

Manage your link collection in a simple way.

mooberrydreams

Mooberry Book Manager is an easy-to-use system for authors to add books to their WordPress websites.
NOTE: <a href="https://www.mooberrybookmanager.com/upgrading-to-mooberry-book-manager-5/" rel="nofollow ugc">Please read this information about updating to version 5 of Mooberry Book Manager and consider installing version 5 now.</a>
No coding is necessary to use Mooberry Book Manager. Adding books is as easy as filling out a form. Include as much or as little information as you want, including the book cover, links to purchase the book, reviews of the book, an excerpt, and more.
Each book can be linked to as many book store retailers to you want. You can even use your affiliate links!
Mooberry Book Manager will create a page for each book, ensuring a consistent look on all of your pages.
Organize your book into grids with just a few clicks. Grids can include all of your books or a selection of books, and you choose how they are ordered. You can create multiple grids; for example, an “Available Now” page and a “Coming Soon” page. Grids update automatically when you edit or add books. Set it and forget it!
Feature books on your sidebar with four options:
<ul>
<li>A random book</li>
<li>The newest book</li>
<li>A book that’s coming soon</li>
<li>A specific book</li>
</ul>
Mooberry Book Manager works with your chosen theme to provide a consistent look throughout your website.
Requires WordPress 3.8+ and Javascript.
Getting Started with Mooberry Book Manager
After installing and activating Mooberry Book Manager, you’ll now have a Books menu. Use that to add your books to your website.
In order for your books to appear on your website, you need to add a Book Grid and/or a Widget.
To Add a Book Grid:
<ul>
<li>Go to Book Grids -> Add New</li>
<li>Give the Book Grid a name to help you remember what kind of grid it is</li>
<li>Choose the books, grouping, and sort order</li>
<li>Save the grid. You will be shown a shortcode. Copy the entire shortcode.</li>
<li>On any page, blog post, etc. paste the shortcode into the text editor.</li>
<li>Save your page and view it. Click on any book to see the details of the book.</li>
</ul>
To Add a Widget:
<ul>
<li>Go to Appearance -> Widget</li>
<li>Drag the Mooberry Book Manager Book Widget to the Widget Area of your choice</li>
<li>Choose the book to display</li>
<li>Save the widget and view your website. Click on the book cover to get the details of the book.</li>
</ul>
Need more?
Premium features are available, from adding multiple authors to creating your own fields to advanced grid filtering and pagination, and more! <a href="https://www.mooberrybookmanager.com/pricing/" rel="nofollow ugc">See the details here.</a>
Additonal questions?
Check out the <a href="http://mooberry-book-manager.helpscoutdocs.com/" rel="nofollow ugc">documentation and support page.</a>
Want regular updates?
<ul>
<li><a href="http://eepurl.com/bwXBPH" rel="nofollow ugc">Subscribe to Mooberry Dreams’ mailing list</a></li>
<li><a href="https://www.facebook.com/MooberryDreams" rel="nofollow ugc">Like Mooberry Dreams on Facebook</a></li>
<li><a href="https://www.facebook.com/groups/mooberrybookmanager/" rel="nofollow ugc">Join the Mooberry Book Manager Users Group on Facebook</a></li>
</ul>
<h4>Translations</h4>
<ul>
<li>English</li>
<li>German</li>
<li>French</li>
<li>Serbo-Croatian</li>
<li>Spanish</li>
<li>Russian</li>
<li>Italian</li>
<li>Greek</li>
<li>Brazilian Portuguese</li>
<li>Chinese</li>
</ul>
NOTE: <a href="https://translate.wordpress.org/projects/wp-plugins/mooberry-book-manager/" rel="nofollow ugc">Mooberry Book Manager is translatable.</a>
<ul>
<li>Thanks to <a href="https://profiles.wordpress.org/thrakonia" rel="nofollow ugc">Kathrin Hamann</a> for providing the German translation!</li>
<li>Thanks to <a href="https://100son.net/" rel="nofollow ugc">Cyrille Sanson</a> for providing the French translation!</li>
<li>Thanks to <a href="http://www.webhostinggeeks.com/" rel="nofollow ugc">Web Hosting Geeks</a> for the Serbo-Croatian translation!</li>
<li>Thanks to Ana Gomez for the Spanish translation!</li>
<li>Thanks to Sergey Kryukov for the Russian translation!</li>
<li>Thanks to Fabrizio Guidicini for the Italian translation!</li>
<li>Thanks to Eleni Linaki for the Greek translation!</li>
<li>Thanks to Vinicius Cubas Brand for the Brazilian Portuguese translation!</li>
<li>Thanks to Jin Gu for the Chinese translation!</li>
</ul>

Mooberry Book Manager

I've looked at alternatives to create catalogs of books for sale on websites, and this is the one that comes closest to the ideal. I use it as the basis for our book listings on the website of a mid-sized publisher.

The plugin author has also been very helpful and responsive to support and feature requests.

Best all around for book catalogs

Sell books via Amazon and other retailers directly from your author website with this easy-to-use system. Creates book pages, widgets, and book grids.

Simple Link Library vs Mooberry Book Manager