RDF GRAph VIsualization Tool (RDF Gravity) is a tool for visualizing directed graphs built in RDF and OWL. The tool provides a simple yet powerful visualization of RDF graph structures and the ability to filter out and visualize specific parts or fragments of RDF Graphs.
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.