CatMDEdit is a metadata editor tool for describing resources, mainly geographic information. Developed by IAAA (University of Zaragoza) and GeoSpatiumLab S.L., sponsored by IGN Spain. Technical details: Java, XML, multiplatform, multilingual.
ThManager is a tool for creating and visualizing knowledge organization models, such as thesauri, classification schemes, glosaries and other types of controlled vocabulary in SKOS format
Curator Archiving Tool is an open source software aimed to manage efectively the proccesses of human cataloguing, publish the digital resources on thematic directories and collections and offer statistical information of added value to end users.
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Desktop tool to organize your personal collection of electronic publications, in particular scientific ones. Also provides back-end libraries (Java) for access to OPF/OCF e-books, usable independently.
BibTeXlipse is an Eclipse plugin for managing and analyse bibliography databases. Mainly for BibTeX databases, but will import and export many other bibliographic formats.
It's currently in planning phase.