Piezomechanik GmbH (Germany)
Piezomechanik GmbH - Munich : Piezo, Nano, Micro, bio, phase shift, injector, piezoelectrics, resonator, motors, optics, space
http://www.piezomechanik.com/

PI Physik Instrumente (Germany)
PI Worldleader: Piezo Stage, Piezo Engineering, NanoPositioning, PZT, Piezo Z-Stage, Piezo Transducer, PZT Actuator, Nanotech, Nanoprecision Resolution, Piezo Ceramic, PI-Piezoactuator, Photonic Packaging Automation, Piezo NanoPositioning, Piezo Motor, Fast Steering Mirror, Linear Slide, Linear Stage, MicroPositioner, Hexapod, Piezo NanoAutomation, Capacitive Sensor
http://www.physikinstrumente.com/

Piezo Systems Jena (Germany)
Provider of piezo electrical stages for nanopositioning, positioning systems and piezo motors.
http://www.piezojena.com/

Cedrat Recherche
Ultrasonic linear piezo motors, drives and actuators. Also dedicated piezo transducer software for motor design.
http://www.cedrat-grenoble.fr

Green Piezo
Manufacturer of piezo electric igniter for gas burners. Located in Republic of Korea. Providing on-line catalog for complete list of products.
http://www.greenpiezo.com

Piezo Ceramic GmbH (Germany)
PIC: Leading Manufacturer: Multilayer Piezo actuators, Piezo Stack, PZT Actuators, Engineered Piezo Ceramics, Piezoelectric Assemblies, Piezo disks, Piezoelectric Components, piezo element, shear piezo, PICMA, PICA
http://www.piceramic.de

Physik Instrumente (PI)
PI Worldleader: Piezo Stage, Piezo Engineering, NanoPositioning, PZT, Piezo Z-Stage, Piezo Transducer, PZT Actuator, Nanotech, Nanoprecision Resolution, Piezo Ceramic, PI-Piezoactuator, Photonic Packaging Automation, Piezo NanoPositioning, Piezo Motor, Fast Steering Mirror, Linear Slide, Linear Stage, MicroPositioner, Hexapod, Piezo NanoAutomation, Capacitive Sensor
http://www.physikinstrumente.com/

Myntahl Corp.
Manufacturer of buzzer, alarm, piezo alarm, electronic buzzers, alarm annunciator, siren, magnetic alarm transducers and external-driven piezo.
http://www.myntahl.com/

Theory and Applications of Piezo Ceramic Actuators and PZT NanoPositioning Systems
Physikinstrumente (Germany) - very good information about piezo actuators and positioning systems.
http://www.physikinstrumente.com/tutorial/index.html

Recommended Reading about Piezoelectricity
Off-the-shelf and custom designed piezo actuators, piezo transducers, sensors, and ultrasonics, plus the electronics to drive them.
http://www.piezo.com/reading.html