Koxx
Koxx is a bicycle maker based in France. Their main business is in Mountain Bike Observed Trials bikes but they also manufacture some freeride bikes and BMXs.
Their riders have often placed in the top levels of trials riding competitions. Riders of note include Vincent Hermance, Gilles Coustellier, Giacomo Coustellier, Marc Vinco, Benito Ros, Marco Hoesel. All of those riders have their own signature bike models, except for Vincent Hermace and Benito Ross who ride the XTP 26" and XTP 20" respectively.
KOXX's flagship models are XTP (in both 26 and 20 inch models) and Levelboss. These bikes are some of Most Expensive trials frames/bikes available.
KOXX also has a separate company called KOXX-ONE which make unicycles. KOXX-ONE makes beginner unicycles as well as 'heavy-duty' trials and mountain unicycles (MUnis).