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ABCD is a Free and Open Source Software designed to support knowledge communities. The software is targeting libraries of universities and research institutes as well as smaller public libraries, documentation centra, musea and archives.
Formerly Slaytanic Scripts. This is the place where you can get addons, tweaks, modules, blocks, etc. designed to work with the great RavenNuke(tm) CMS developed by Jonathan Estrella.
This is a basic substitute for expensive library software. It will require you to manually enter all the titles, authors, and ISBN-13s into a database at first, but after that maintenance is easy.