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.

Using OpenRefine, by Ruben Verborgh and Max De Wilde, offers a great introduction to OpenRefine.

Another introduction in German is Datentransformation mit OpenRefine, part of a seminar for librarians.

Visit the official web site for videos and full documentation.

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