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.
