DesAcc, Inc.
DesAcc, Inc. Provides Tools for Accessing, Organizing, and Working with Your Health Informatics Data
http://www.desacc.com/index.html

InterSense
InterSense; Inc.; the market leader in precision motion tracking technology
http://www.isense.com/

Wave Modes Produced by Air Coupled Ultrasound
by Jan O. Strycek, Willem A. Grandia, and Hanspeter Loertscher (NDT-net)
http://www.ndt.net/article/wsho0597/qmi2/qmi2.htm

GSI (General Sound Interface)
An audio system with network support and provides the ability to use stereo, 3D audio, doppler effects, music playing (MIDI, HMP, MUS), and cd playing and ejecting/changing. [Open source, BSD License]
http://gsi.sourceforge.net/

SonTek / YSI
SonTek/YSI makes 2D and 3D ADCP/ADP Acoustic Doppler Current Profilers, ADV velocimeters, DVL speed logs, and Argonaut currentmeter water velocity sensors
http://www.sontek.com/

Medical Soft: BABE
Offers a DOS program that generates OB ultrasound report and graphs for physician and sonographers.
http://www.babesoftware.com

Keitzer Manufacturing (USA)
Offering products for medical professionals and ancillary services including physical therapy, x-ray and chiropractic equipment.
http://www.keitzer.com/products/ultrasnd.html

All Imaging Systems, Inc. (USA)
Offering an extensive range of new, used, refurbished/reconditioned ultrasound systems and transducers/probes. All Imaging Systems is a leader in ultrasound equipment and servicing.
http://www.allimaging.com

CVS
Cardio Vascular Sales: Sales, service, parts & training for ultrasound machines. Many new and used ultrasounds in stock with probes and configurations to fit your application and budget.
http://www.cvsales.com/

Peridot Technologies (Pvt.) Ltd.
Offers customized software solutions at affordable prices, Specializes in custom software design & development. Products [Backup utility & Ultrasound imaging]
http://www.peridotec.com/