Bulk edit and data massaging. Check out OpenRefine. Intro tutorial.
Manipulate data, for example vocabulary lists. Input from csv, tsv, and many more file types. If you like BulkEdit in SIL Fieldworks, you will love this.
Unable to edit my original posting. Of interest to people doing Natural Language Processing with Latin.
New to me is the Excel Power Query, which has similar capabilities, and more. Check it out!