tracker3: Tracker (semantic data storage search engine) tracker3: tracker3: Tracker is a search engine and that allows the user to find their tracker3: data as fast as possible. Users can search for their files and search tracker3: for content in their files too. Tracker is a semantic data storage tracker3: for desktop and mobile devices. Tracker uses W3C standards for RDF tracker3: ontologies using Nepomuk with SPARQL to query and update the data. tracker3: Tracker is a central repository of user information, that provides tracker3: two big benefits for the desktop; shared data between applications tracker3: and information which is relational to other information (e.g. mixing tracker3: contacts with files, locations, activities and etcetera).