DataWrangler – Interactive Tool for Data Cleaning and Transformation
http://vis.stanford.edu/wrangler/

DataWrangler with these features: a) Too much time is spent manipulating data just to get analysis and visualization tools to read it. Wrangler is designed to accelerate this process: spend less time fighting with your data and more time learning from it; b) •Wrangler allows interactive transformation of messy, real-world data into the data tables analysis tools expect. Export data for use in Excel, R, Tableau, Protovis, …; c) •Want to learn more about Wrangler’s design? Take a look at their research paper; and d) •Wrangler is still a work-in-progress. This will be added to the tools section of Research Resources Subject Tracer™.