ARC is a flexible RDF system for semantic web and PHP practitioners. It's free, open-source, easy to use, and runs in most web server environments. RDF and SPARQL for LAMP systems
Many RDF toolkits provide SPARQL/Update functionality and move from simple query operations to more powerful data manipulation. SPARQLScript goes another step further and enables or simplifies the implementation of
* semantic Mashups,
* custom, portable rule and inference scripts using a SPARQL-based syntax
* Output templates for RDF data and SPARQL query results
* RDF/SPARQL-driven Yahoo! Pipes-like systems
NutchWAX ("Nutch + Web Archive eXtensions" ) searches web archive collections. The Web Archive eXtensions (WAX) include adaptation of the Nutch fetcher step to go against web archives rather than crawl the open net -- adaptation currently does Internet Archive ARC files only -- and plugins to add extra fields to the index that return an Archive Records' location in the repository, its collection name, etc.
World Wind lets you zoom from satellite altitude into any place on Earth. Leveraging Landsat satellite imagery and Shuttle Radar Topography Mission data, World Wind lets you experience Earth terrain in visually rich 3D, just as if you were really there.