Recently, a fellow Drupalist asked me a really good question, approximately worded: “what are the modules you are familiar.” This is a great question, and I wanted to pick some awe inspiring modules that had a 'wow-factor' but all I could think of was “link,” “devel,” but what I wanted to say was some great module that really did everything and summarized what Drupal is all about.
Contributed during 2005-2011 on the Open Source Integrated Library System (ILS), Koha. There were few libraries running Koha in 2005.
In 2006 started the migration scripts to move from a large proprietary multi-valued database system housing the prior ILS for importation into Koha, and began writing utilities in PHP to use with the new Koha system, since the Koha Perl code base was not yet fully open or available for the new system which used the Zebra search engine.
Koha is now used in hundreds of libraries in the United States as well as at least hundreds more world wide.
The Google Books module is a filter module and an API for http://books.google.com, that allows a user to insert rich Google Book data into nodes via filters with JSON data retrieved from the Google domain.
book data from Google into pages using Drupal filters, There are options to include / exclude any data fields,
a book cover image when it exists
There are many search options with Google books and many options to display that data within the Google Book module. The API pulls data from Google Books in a generic way. This module includes data caching so once the book information is loaded the first time with a request for JSON data, the subsequent requests are very fast.