NNDB Mapper [nndb.com] is an interactive visualization tool for exploring the connections between people in the Notable Names Database (NNDB), a huge data source containing the biographical details of over 34,000 persons for whom the public has demonstrated a permanent interest. The online application links all the people together through family relations, corporate boards, movies and TV, political alliances, or shadowy conspiracy groups, meanwhile also revealing their age, religion or organization. Individual maps can be saved and shared for others to explore.
The relationships between people and other entities are represented through a simple network view (e.g. Dick Cheney), while some subjects and themes also include a timeline view (e.g. physicists). Map views can be custom-made and stored for others to see (e.g. all the corporate and political connections throughout the Fox Family or the founding fathers).
See also the good old They Rule.