"The Evergreen Project develops an open source ILS (integrated library system) used by approximately 1,800 libraries around the world. The software, also called Evergreen, is used by libraries to provide their public catalog interface as well as to manage back-of-house operations such as circulation (checkouts and checkins), acquisition of library materials, and (particularly in the case of Evergreen) sharing resources among groups of libraries."
"The world's first free and open source library system. Koha is a fully featured, scalable library management system. Development is sponsored by libraries of varying types and sizes, volunteers, and support companies worldwide."
"LibLime Koha is the most advanced open-source Integrated Library System in use today by hundreds of libraries worldwide.
LibLime Koha is web based, so there is no software to install on desktop computers, and LibLime hosting services means that no servers are required in the libraries. LibLime's IT experts manage all upgrades, backups and general system maintenance, and the Library's local IT staff can focus on the Library's many other projects."
"Greenstone is a suite of software for building and distributing digital library collections. It provides a way of organizing information and publishing it on the web or on removable media such as DVD and USB flash drives."