Wikipedia
PCD Maltron Ltd., d.b.a. Maltron, is a manufacturer of ergonomic special-needs keyboards, founded by South African-born inventor Lillian Malt, the namesake of the company, and manufacturer Stephen Hobday. Maltron specialises in making keyboards for the prevention and etiological (root cause) treatment of repetitive strain injury.
Maltron manufactures several models of keyboards, in varying levels of adaptation. Lillian Malt's original invention and the company's flagship design known as the Fully Ergonomic 3D Keyboard is the most highly adapted; it incorporates a curved surface for the keyboard, in which the keys' angles and depth are staggered to compensate for the different lengths and placement of the fingers. An integral trackball mouse is a customer-selectable option at additional cost. Other keyboard types available are single hand keyboards which are ergonomically designed to be used by only the left or right hand, a flat version of the fully ergonomic keyboard, a keyboard designed to be used by a single digit or head stick or mouth stick, and a robust expanded keyboard designed primarily to assist people with cerebral palsy. Maltron keyboards are electrically compatible with IBM PC keyboards and Apple Macintosh keyboards, using USB connectors. Earlier connectors included DIN and PS2 but these are now discontinued.