WebLibrarian (weblibrarian) free WordPress plugin

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.