VuFind - VuFind is a library resource portal designed and developed for libraries by libraries.
Invenio - Invenio is a free, open-source software to run a digital library or document repository on the web.
Blacklight - Blacklight is a free and open source ruby-on-rails based discovery interface (a.k.a.
Greenstone Digital Library - Greenstone is a suite of software tools for building and distributing digital library collections...
OpenBiblio - It is an easy to use, automated library system written in PHP containing OPAC, circulation...
Koha - Koha is the first free and open source software library automation package (ILS).