G/C and D/G tunings

G/C
    Open G chanterelles - both are g'/G4 (octave G/C tuning would have g/G3 and a g'/G4 string) and
    Trompette - c'/C4 (middle C) for key of C; d'/D4 for key of G.
    Mouche - g/G3
    Petit Bourdon - c/C3 [ usually not used for key of G ]; can tune up to d/D3 for G tuning.
    Gros Bourdon - G/G2 [ usually not used for key of C ]

Keyboard as seen by player

D/G
    Open D chanterelles, octave tuned - d' and d"/D4 and D5 (a 3-chanter instrument would have a d/D3 string)
    Trompette - d'/D4
    Mouche - g/G3 [ usually not used ]
    Petit bourdon - d/D3
    Gros bourdon - G/G2, or drop to D/D2

Keyboard as seen by player