OpenRefine

http://openrefine.org/

A free, open source, powerful tool for working with messy data

OpenRefine (formerly Google Refine) is a powerful tool for working with messy data: cleaning it; transforming it from one format into another; and extending it with web services and external data.

Please note that since October 2nd, 2012, Google is not actively supporting this project, which has now been rebranded to OpenRefine. Project development, documentation and promotion is now fully supported by volunteers.

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more on big data in this IMS blog
https://blog.stcloudstate.edu/ims?s=big+data

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