Charmed Technology, Inc.
Offers wearable computer hardware, a smart badge, and an operating system. Publishes also board layouts and construction diagrams.

Ingineo
Offers turn key wearable computing solutions especially developed for industrial applications.

ViA-Computers
Produces full-function wearable computers allows mobile workers hands-free computing.

Xybernaut
Research, development and commercialization of computer technology, hardware, and related software for wearable systems.

PCOnHand.com
Producer of a watch with computing power comparable to first Palms capable of off-line browsing and spreadsheet calculation. Shows off device, available software and screenshots.