Next-L Enju is a open source ILS developed by Project Next-L, a librarian community in Japan. It has following components;

• Cataloging
• Patron management
• Circulation
• OAI-PMH provider
• Reference management
• Import and export bibliographic records (CSV/XML)

Almost all components have RESTful Web API.

Next-L Enju is built on Ruby on Rails, PostgreSQL/MySQL and Apache Solr.