VARD 2 is a free, creative commons tool for preprocessing historical corpora. Built in Java, it enables researchers to easily match up historic variant spellings with modern conventions. Though optimized for Early Modern English, other languages can be accomodated with user-supplied variant word lists.
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VARD 2 also appears in Project Bamboo's DiRT, a registry of digital tools suitable for academic research. DiRT contains a wide range of tools and software searchable by task, such as annotation, content management, collaborative research, or authoring. It is an excellent resource for Digital Humanists seeking the right tool for the task at hand.
View VARD 2 in DiRT:
http://dirt.projectbamboo.org/resources/vard
View the full site:
http://dirt.projectbamboo.org/
VARD was discussed in these research abstracts https://dh2018.adho.org/en/adapting-a-spelling-normalization-tool-designed-for-english-to-17th-century-dutch/
https://dh2016.adho.org/abstracts/16