|Developer(s)||Georgia Public Library Service (GPLS) Public Information Network for Electronic Services (PINES) and the Evergreen Community|
|Initial release||September 2006|
|Stable release||2.3.4 / February 22, 2013|
|Written in||C, Perl, XUL, JS|
|Type||Integrated library system|
|License||GNU General Public License|
Evergreen is an open source Integrated Library System (ILS), initially developed by the Georgia Public Library Service for Public Information Network for Electronic Services (PINES), a statewide resource-sharing consortium with over 270 member libraries.
In 2007, the original Evergreen development team formed a commercial company around the software, Equinox Software, which provides custom support, development, migration, training, and consultation for Evergreen.
Evergreen was developed by the Georgia Public Library Service (GPLS) to support 252 public libraries in the Public Information Network for Electronic Services (PINES) consortium. Development began in June 2004 when state librarian Lamar Veatch announced in an open letter that after reviewing options available, GPLS decided to develop its own library automation system. GPLS believed it could develop a system customized to fit it needs better at a lower cost than the fees currently being paid. Programmers in the GPLS developed the project for two years, and PINES successfully completed the transition to Evergreen in September 5, 2006. In the next two years, the PINES consortium increased to over 270 libraries and five other systems in the United States and Canada implemented Evergreen.
Other Evergreen implementations in North America:
- Beauregard Parish Library (Louisiana, 6 branches)
- British Columbia SITKA (69 libraries, including branches)
- Consortium Of Ohio Libraries COOL (5 libraries)
- Indiana Evergreen (112 libraries)
- Kentony County Public Library (Kentucky, 3 libraries)
- Library of Virginia (7 Pilot Libraries, 5 systems live as of 5/01/2013)
- Maine Balsom (10 libraries)
- Merrimack Valley (Massachusetts, 39 libraries all went live over Memorial Day Weekend 5/31/2011)
- Michigan Evergreen (6 libraries)
- Mohawk College Library (3 libraries)
- Niagara Libraries (Ontario, 11 libraries),
- North Texas Library Partners (rural area outside Dallas, 12 libraries),
- Pioneer Library System (Upstate New York between Rochester and Syracuse, 42 libraries),
- Project Conifer (Ontario, 20 libraries)
- Sage Library System (Northeast Oregon, 60 libraries)
- SCLENDS (South Carolina, 19 counties plus the State Library of SC)
- SPRUCE (Manitoba, Canada, 8 libraries)
- Traverse Area District Library (Michigan, 6 libraries)
- NOBLE - North of Boston Library Exchange (Massachusetts), including Wakefield, MA's Bebe Library (Bebe - May 2012)
Development priorities for Evergreen are that it be stable, robust, flexible, secure, and user-friendly.
Evergreen's features include:
- Circulation: for staff to check items in and out to patrons
- Cataloging: to add items to the library’s collection and input information, classifying and indexing those items.
- Online public access catalog (OPAC): a public catalog, or discovery interface, for patrons to find and request books, view their account information, and save book information in Evergreen "bookbags." The OPAC received a makeover in early 2009 with the new, optional skin, Craftsman.
- Acquisitions: for staff to keep track of those materials purchased; invoices, purchase orders, selection lists, etc.
- Statistical Reporting: flexible, powerful reporting for retrieval of any statistical information stored in the database.
- SIP 2.0 support: for interaction with computer management software, self-check machines, and other applications.
- Search/Retrieve via URL and Z39.50 servers
Evergreen also features the Open Scalable Request Framework (OpenSRF, pronounced 'open surf'), a stateful, decentralized service architecture that allows developers to create applications for Evergreen with a minimum of knowledge of its structure.
Evergreen runs on Linux servers and uses PostgreSQL for its backend database. The staff client used in day-to-day operations by library staff runs on Microsoft Windows, Macintosh, or Linux computers and is built on XULRunner, a Mozilla-based runtime that uses the same technology stack as Firefox and allows for a browser-independent offline mode. The online public access catalog (OPAC) used by library patrons is accessed online in a web browser.
Other Open Source Integrated Library Systems (ILS) 
Evergreen Implementation, Hosting, and Support Service Providers 
- Official Evergreen project website
- Evergreen source code repositories
- Evergreen blog
- Evergreen development roadmap
- Equinox Software
- Evergreen at Freecode
- "Evergreen: Your Homegrown ILS - An in-house team successfully competes with commercial vendors in the library automation sphere" Library Journal article
- "Librarians stake their future on open source"
- PINES catalog
- Evergreen online demo server
- http://www.libraryjournal.com/article/CA6396354.html Weber, J (2006). "Evergreen: Your Homegrown ILS", "Library Journal", 131(20).
- http://evergreen-ils.org/dokuwiki/doku.php?id=evergreen_libraries List of known sites running Evergreen
- http://www.mlcnet.org/cms/sitem.cfm/library_tools/michigan_evergreen/ Michigan Evergreen
- http://www.in.gov/library/evergreen.htm Evergreen Indiana
- http://sitka.bclibraries.ca/ British Columbia Sitka
- Breeding, M. (2007). Next-generation flavor in integrated online catalogs. Library Technology Reports, 43(4) 38-41.
- Breeding, M. (2008). Major open source ILS products. Library Technology Reports, 44(8) 16-31.