Updated March 25th, 2022: The main Voyant site has been having some unspecified server issues that seem to have knocked my corpus offline, so I have moved the project to one of the mirrors they recommend, voyant.lincsproject.ca
The Voyant Java application is available on their Github Repository: https://github.com/sgsinclair/Voyant
I did much of my work using the local server version; it works a bit faster, but provides no easy way to share the interactive results.