AboutThisDay.com is a date based 'on this day in history' style search engine of facts like births and deaths of people, events and holidays. You can refine the results using year range and category filters and the results are sorted using a home-grown popularity algorithm
OntoWiki facilitates the visual presentation of a knowledge base as an information map, with different views on instance data. It enables intuitive authoring of semantic content, with an inline editing mode for editing RDF content, similar to WYSIWIG for text documents.
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M. Knuth, J. Hercher, and H. Sack. Proc. of. 2nd Int. Workshop on Usage Analysis and the Web of Data (USEWOD 2012), co-located with the 21st International World Wide Web Conference 2012 (WWW 2012), April 17, 2012, Lyon (France), (2012)