This plugin is used to create a page on your web site that will contain a list of all link categories that you have defined inside of the Links section of the WordPress administration, along with all links defined in these categories. The user can select a sub-set of categories to be displayed. 
It also contains a configuration page, to be able to configure all outputs. 
It is a very slim plugin.

WP-Partner

The purpose of this plugin is to add the ability to output a list of link categories and a complete list of links with notes and descriptions.

Robert Heller

This WordPress plugin started as a portable, cross-platform system that 
the Wendell Free Library could use as a transition system from its current 
paper card based circulation system to the system that will eventually 
be rolled out by the regional library system. It has ‘morphed’ to a 
web-based successor to Deepwoods Software’s Home Librarian 3 system.
This plugin implements a simple and basic, web-based, library catalog 
and circulation system. There are short codes that can be added to 
pages of a WordPress site to search and display items in the library 
collection. And there are back-end (admin) pages that implement 
management of the collection, management of patrons (users) of the 
library, as well as implementing the functionality of a circulation 
desk.

WebLibrarian

A WordPress plugin that implements a basic library collection and
circulation system.

WP-Partner vs WebLibrarian