Koha is a popular open source integrated library system (ILS) that is freely available and used by many libraries worldwide. It provides a full suite of library management features including cataloging, circulation, serials management, acquisition, and a public catalog/OPAC. Key advantages of Koha include low costs since it has no licensing fees, ability to customize it to local needs, and ongoing development and support from a global community of libraries. System requirements are modest, primarily needing a web server, database, and web browsers on staff and patron workstations.