Aperture is a Java framework for extracting and querying full-text content and metadata from various information systems (e.g. file systems, web sites, mail boxes) and the file formats (e.g. documents, images) occurring in these systems.
My first experiment with OpenCalais involved OpenOffice. I use OpenOffice intensively (as a direct replacement for the Microsoft Office line of shovelware), and although OpenOffice (like Office) has more than its fair share of annoyances, it also has some features that are just plain crazy-useful, such as support for Macros written in any of four languages (Python, Basic, beanshell, and JavaScript). The JavaScript binding is particularly useful, since it's implemented in Java and allows you to tap the power of the JRE. But I'm getting ahead of myself.
Babelfy is a unified graph-based approach to multilingual Entity Linking and Word Sense Disambiguation based on a loose identification of candidate meanings coupled with a densest subgraph heuristic which selects high-coherence semantic interpretations.
Bibster is a Java-based system which assists researchers in managing, searching, and sharing bibliographic metadata (e.g. from BibTeX files) in a peer-to-peer network.
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