If you need visualization of either simple data sets or complex, time-dependent data from disparate sources, OpenDX lets you easily gain meaningful insight into your data. If you are looking to build visualization applications for your end users, OpenDX h
Exemplary sites covered here include: WikiViz, FreeMind, Visualizious, Tree Radial Balloon Layout, Comment Flow, OneWord, Del.icio.us Network Explorer, Bubbl.us, ClusterBall, and data visualization of a social network.
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D. Shahaf, C. Guestrin, and E. Horvitz. Proceedings of the 21st International Conference on World Wide Web, page 899--908. New York, NY, USA, ACM, (2012)