Manufacturer
Suzhou, China
TSDZ torque-sensing mid-drives. TSDZ2B is the current open-source-friendly kit.
Tongsheng
Torque-sensing mid-drive. Kit listings at $331. Common voltage is 36 or 48 V. Rated watts were not in the price table used here.
Power unstatedMid-driveOff-road
US$331
ConvoKits