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Yes. The code is freely available under the terms of The BSD License.

Download from https://github.com/hebcal/dotcom.

hebcal.com depends on https://github.com/mjradwin/hebcal, currently a fork of the mainline https://github.com/hebcal/hebcal repository.

The only difference between the main hebcal/hebcal program and the mjradwin fork is the use of a different sunrise/sunset algorithm that supports Olson tzdb timezones