Thumbscript
Offers hard- and software solutions for entering text using a thumb-operated 9-keys keyboard.

Handykey Corporation
Sells combination of chording keyboard and mouse, called Twiddler, that weighs 4 ounces and fits in the palm of a hand.

L3 Systems
Manufacturer of a 39-keys wrist-worn PC keyboard as well as customized keyboard controllers.

WetPC
Makes an intuitive human machine interface suitable for wearable, handheld, underwater and mobile computing.

Matias Half Keyboard
One-handed keyboard for PDAs and PCs. Special version with straps available. Use is explained in a flash demo and a downloadable one.

NumberPad as one-handed Keyboard
The linux kernel patch (2.2 & 2.4) allows to type two-digit numbers on a number pad to simulate characters and special keys.

FrogPad
One-handed 3x5 USB keyboard with "patented" key layout but no straps. On-line available are a shop, training material and licensing ideas for different devices.

Inference Group - Dasher Project
A software solution for entering text by zooming through letters. A graphical demo, versions for different systems and languages and ideas for appropriate input hardware are provided.

Lightglove
Air typing by blocking watch-like attached lasers with fingers. Presents some infos on technology, photos and the patent abstract.

Kitty
Typing by touching the thumbs with different fingers and at different positions analog to a normal keyboard. With Flash demo, prototype photos and press overview.