I wonder if there is any go pairing program for double elimination? If yes, is it free or paid software? Thank you

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Du hoc My | Du hoc Uc | My Ninja Works

For double elimination you don't really need a pairing program, just use a printed layout like

http://www.printyourbrackets.com/index.html

or

http://www.tournamentdesign.org/

But why a double elimination tournament in the first place?
see also Double Knockout Tournament Format

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Promotor and Librarian of Sensei's Library

Thanks a lot

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Du hoc My | Du hoc Uc | My Ninja Works

http://challonge.com/

this site has also been used in few double elimination go tournaments.