Are you interested in how things are related with each other? The flash-based RelFinder helps to get an overview: It extracts and visualizes relationships between given objects in RDF data and makes these relationships interactively explorable.
AboutThisDay.com is a date-based "on this day in history" style search engine of facts like births & deaths of people, events and holidays. Provides year range and category filters to refine the results and a home-grown popularity algorithm to sort the results.
The DBpedia DataID vocabulary is a meta-data system for detailed descriptions of datasets and their different manifestations, as well as relations to agents like persons or organizations, in regard to their rights and responsibilities.
DBpedia Mobile is a location-centric DBpedia client application for mobile devices consisting of a map view, the Marbles Linked Data Browser and a GPS-enabled launcher application.