OT: open source software question

Does anyone know what software is behind http://www.visuwords.com/?word=dictionary
I'd like to try implementing a cross-reference navigation tool based on this technology.
Orthodox Bishop Alfeyev: "To be a theologian means to have experience of a personal encounter with God through prayer and worship."; Orthodox proverb: "We know where the Church is, we do not know where it is not."
Comments
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Why not ask them? Their website says:
Questions and comments: admin@visuwords.com
EDIT: I should probably have said "ask him." Down at the bottom of the site it says designed and developed by the logicalOctopus
And if you follow that link you get to the Logical Octopus site ("The Logical Octopus, also known as Paul Dunn, is a freelance programmer
with more than 20 years of professional programming and web development
experience. "), with this email address on its Contact page: paul.dunn@logicaloctopus.com0