OPACIAL: A Web 2.0 open source Online Public Access Catalog  
   
  SourceForge website: http://sourceforge.net/projects/opacial/
  Download latest release: opacial_v1-2.zip
  Technical documentation: OPACIAL_Documentation_v1-0.pdf
  See an online demo at: Panteion University Library & Information Service

  Screenshots:

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