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

Wrangler is an interactive tool for data cleaning and transformation. Spend less time formatting and more time analyzing your data. Why wrangle? 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 has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This will be added to Web Data Extractors white paper.