"The oldest open source ILS is Koha, which was first developed for public libraries in New Zealand. The Koha back-end is written in Perl, uses the MySQL database, and runs on the Apache Web server. The front-ends are Web-based and accessible on any well-supported browser. Koha supports full-featured catalog management, incorporating the industry-standard MARC formats and the Library of Congress' z39.50, and can manage digital collections in the same database as printed material. It manages periodicals, circulation tracking, and acquisition, and can use email and RSS notification, is multi-lingual, and includes a Web-based OPAC.
"Koha is designed to be scalable to libraries of different sizes, from small private collections to large, geographically-remote library systems with multiple branch locations. The Koha project site does not track a complete list of Koha installations, but notes that there are at least 1000 sites known to be using the code--many in the United States, but on at least three other continents as well."
