The grasshopper is just another escapement found and offered in Gearotic and is classified as an unusual low friction device for pendulum clocks. Designed in the 1700's, it was added in Gearotic's clock frameworks to assist any users in building one.
The escapement itself is a mechanical linkage that gives pushes to a wheel keeping it rotating back and forth and allows each swing of the wheel to move a gear train to advance a fixed amount depending on the design. The term "grasshopper" was apparently given to this apparatus from the kicking action of the pallets
and first appears in The Horological Journal in the late 19th century.
One of the advantages of the grasshopper escapement is its repeatability of operation and its freedom from lubrication. As one pallet is released only by the engagement of the other, the impulse given to the pendulum is thus completely regular in its timing and they do work quite well.