Infovore is a map/reduce framework for processing large RDF data sets such as Freebase and DBpedia. It is based on Hadoop.
InstanceXL is a tool that displays ontologies as spreadsheets. It can be used as a standalone application or as a plugin for the Protégé Editor.
EasyRdf is a PHP library designed to make it easy to consume and produce RDF. It was designed for use in mixed teams of experienced and inexperienced RDF developers.
MIM:InfiniX is a multisite and multilanguage CMS. It lets you design your CMS and store data in XML files and/or MySQL databases. You can set up different virtual hosts.
A 3D Rubik's cube game.
A probabilistic Java toolkit for building search engines.