| Name | Website | Online Demo | OPAC, Acqusitions, Cataloging & Circulation | MARC Support | Platform | Latest Release* | Other Key Information |
| Koha | http://www.koha.org | Demo | Yes | Yes | LAMP (Perl) | 2.0.0: Released 2004-03-24 | First OSS Library Management System |
| Emilda | http://www.emilda.org/ | Demo | Yes | 100% MARC Compatible using Zebra | LAMPP (Perl & PHP) | 1.1.0: Released 2004-01-23 | Customizable template based layout |
| PhpMyLibrary | http://phpmylibrary.sourceforge.net/ | Demo | Yes | Strictly follows the USMARC standard for adding materials | PHP & MySQL, Apache | 2.0.2-1: Released 2002-10-31** | Originally developed for Win32 (MS Windows) |
| phpmybibli | http://www.pizz.net/ | Demo | Yes | UNIMARC Support | LAMP (PHP) | 1.1: Release date unknown | Includes Authorities Management & Periodicals Support |
| OpenBiblio | http://obiblio.sourceforge.net | Demo | OPAC, Cataloging & Circulation | UNIMARC Support | LAMP (PHP) | 0.4.0: Released 2003-05-13 | Includes staff administration & reporting functionality |
| Avanti MicroLCS | http://www.avantilibrarysystems.com | No | OPAC & Cataloging | No | Written in 100% pure Java | 1.0 beta 2: Released over a year ago*** | Implememtation Neutral & Platform Independent |
* Latest release dates were updated on April 19, 2004.
** Although a new version has not been released in a while, the developers are working on a new version.
*** Avanti MicroLCS 1.0 Beta 3 is due out soon.