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Hebcal for UNIX is a free program and is available for download at https://github.com/hebcal/hebcal. This is the same engine that powers the hebcal.com website. The downloadable program has a text (command-line) interface, not a fancy graphical one.

Kaluach is an unrelated program available at http://www.kaluach.com/. The author requests donations, but does not have a set price.