As of June 2018, VisualText and its core engine for NLP++ are now opensource and free to be used by anyone. The company Text Analysis International was dissolved in 2018 who owned the software and the software is now an open source project run by the two architects Amnon Meyers and David de Hilster.
This software is bound by the MIT Open Source License which can be found here.
You can find the source code in github at http://github.com/VisualText
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