Cedrat Recherche: Ultrasonic linear piezo motors, drives and actuators. Also dedicated piezo transducer software for motor design.
Cranfield University - Nanotechnology: Piezoelectric materials, motors, microsystems (MEMS) and actuator design.
Flexmotor - Motors and Micromotors: Innovative piezoelectric ultrasonic motor and micromotors for low cost, high volume manufacture for automotive, MEMS and consumer products. Low profile piezomotor and scalable to 2mm diameter.
Institute of Piezomechanics: Ultrasonic actuator and motor research in Kaunas, Lithuania from 1970. Multi degree of freedom motors for robotics.
MicroPropulsion Corp (USA): Ultrasonic motors, piezoelectric transformers, miniature generators.
Piezo Ceramic GmbH (Germany): Ultrasonic motor manufacturer. Also piezo ceramic, PZT transducers & actuators.
Piezoelectric Products: EDO Ceramics Corp supplying transducers, actuator and a linear ultrasonic motor
Shinsei Ultrasonic Motors: First commercial manufacturer of rotary travelling wave ultrasonic motors since 1986.
Surface Acoustic Wave Linear Motor: SAW linear motors. Article describing the principle, experiment and conclusions and future reading.
Ultrasonic Motors: JPL's NDEAA Group work for space application of piezo devices up to year 2000 including commercially available motors.