Conceptdraw.com. Lovely Charts. CartoDB. Wrangler. UPDATE: The Stanford/Berkeley Wrangler research project is complete, and the software is no longer actively supported. Instead, we have started a commercial venture, Trifacta. For the most recent version of the tool, see the free Trifacta Wrangler.
Why wrangle? Too much time is spent manipulating data just to get analysis and visualization tools to read it. Quadrigram. Tableau Public. SimpleDiagrams.