Comment (by Zach Etienne):

ET_BHaHAHA (the Einstein Toolkit implementation of BHaHAHA) can be found here:

https://bitbucket.org/einsteintoolkit/einsteinanalysis/src/master/ET_BHaHAHA/

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2918/include-bhahaha