Evergreen source
Highly-scalable software for libraries that helps library patrons find library materials, and helps libraries manage, catalog, and circulate those materials.
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Self-hosted Document Management - Integrated Library Systems (ILS) software (2026)
An [integrated library system](https://en.wikipedia.org/wiki/Integrated_library_system) is an enterprise resource planning system for a library, used to track items owned, orders made, bills paid, and patrons who have borrowed.
Related: Content Management Systems (CMS) · Archiving and Digital Preservation (DP)
3 open-source apps · all free & self-hostable
Koha source
Enterprise-class ILS with modules for acquisitions, circulation, cataloging, label printing, offline circulation for when Internet access is not available, and much more.
RERO ILS source
Large-scale ILS that can be run as a service with consortial features, intended primarily for library networks. Includes most standard modules (circulation, acquisitions, cataloging,...) and a web-based public and professional interface.