An open source (GPL) program package that parses and inserts the RDF into a database and displays the ODP data from the database using PHP. The PHP script supports caching, some templating and searching. Documentation and SourceForge project page.
A commercial search engine solution that parses the RDF dump to import the entire Open Directory onto a local server. The URL listings can be spidered and indexed to build a large full-text search engine.
A collaborative project whose goal is to create Open Source Web Catalog software for various platforms and languages that can selectively import data from the Open Directory Project. Early releases are currently available for Perl, ASP, and PHP.