Emilda is an Integrated Library System that features an OPAC, circulation and administration functions, Z39.50 capabilities, and 100% MARC compatibility. MARC compatibility is achieved using the Zebra server from Indexdata in conjunction with MySQL. Emilda is mainly written in PHP, but Perl scripts exist for MARC manipulation and shell interaction.
METAMOD is a portal solution providing Discovery, Access and Retrieve functionality for scientific datasets along with tools for DAR metadata like automatic extraction, manual editing, and conversion between different formats. Metadata can be converted to different formats and exposed using different search interfaces, i.e. ISO23950 and OAI-PM. It has been designed to be easily integratable with OpENDAP or FTP data servers, and allows data to be uploaded through FTP and HTTP interfaces. A WMS client is built in for visualizing the data.
Net::Z3950::SimpleServer is a Perl module which implements the server side of the Z39.50 (information retrieval) protocol. It hides the complexity of network exchanges, packet serialization, and session handling. You are required only to implement simple callbacks to support searching and record retrieval. It is the basis of the "Zoogle" project, which is a Z39.50 gateway to the Google web index.
OpenIsis provides a library and tools to access CDS/ISIS databases, which are mostly used for bibliographic data (ISO2709, Z39.50) but also well suited for other catalogues due to the very flexible indexing mechanism. Based on a C library, there are also bindings for Perl and Java (Tcl to come).
The Virtual Data Center (VDC) is a digital library system "in a box" for numeric data. It provides a complete system for the management, dissemination, exchange, and citation of virtual collections of quantitative data. It provides everything necessary to maintain and disseminate an individual collection of research studies: including facilities for the storage, archiving, cataloging, translation, and dissemination of each collection. On-line analysis is provided, powered by the R Statistical environment.