I think this is the package spec: https://github.com/caskroom/homebrew-cask/blob/master/Casks/bitkeeper.rb https://github.com/caskroom/homebrew-cask/blob/master

I think this is the package spec: https://github.com/caskroom/homebrew-cask/blob/master/Casks/bitkeeper.rb https://github.com/caskroom/homebrew-cask/blob/master/Casks/... So it's using the installer from bitkeeper.org; I don't know if the people who added it to homebrew are affiliated.