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Re:Guitar – Git GUI Client by aitchnyu on Wednesday April 22, 2020 @09:13AM (#22945162)
It exists and was active till 2013 cwww.edenwaith.com/products/guitar/
Re:Guitar – Git GUI Client by xenonite on Wednesday April 22, 2020 @11:16AM (#22946427)
If some likes to push a homebrew cask package for it, here is a possible source:

  cask 'gui-tar' do
    version '1.2.4'
    sha256 'e11177b99a01d5cff666f68072fd2145cccda4678a8a98203d97929cbe53dea2'

    url "http://www.edenwaith.com/downloads/guitar.dmg"
    name 'GUI Tar'
    homepage 'http://www.edenwaith.com/products/guitar/'

    app 'GUI Tar.app'
  end