Florence is an extensible scalable virtual keyboard for X. You need it if you can't use a real hardware keyboard, for example because of injury, handicap, your keyboard is broken or because you use a tablet PC, but you must be able to use a pointing device (as a mouse, a trackball, a touchscreen or opengazer); If you can't use a pointing device, there is gok, which can be used with just simple switches.
Physical disability

mouse4all is an accessibility solution that allows the use of Android tablets and smartphones without touching the screen. It enhances the autonomy of its users enabling the access to Internet, social networks and all types of applications. mouse4all allows the connection of switches, mice, trackballs and joysticks to any Android device.
Android Central - Hank Torres, who is paralyzed from the shoulders down, set a world record with Swype and a head tracking device at the Assistive Technology Industry Association Conference in Orlando.
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Malcolm Bellamy's Lifelong Learning Blog - For those people who want to see what technology can really do to aid learning I would suggest that they see the above video.
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In electrical engineering, a switch is an electrical component that can break an electrical circuit, interrupting the current or diverting it from one conductor to another.
Source: Wikipedia

A pointing device is an input interface (specifically a human interface device) that allows a user to input spatial (i.e., continuous and multi-dimensional) data to a computer. CAD systems and graphical user interfaces (GUI) allow the user to control and provide data to the computer using physical gestures by moving a hand-held mouse or similar device across the surface of the physical desktop and activating switches on the mouse.

Quha oy is a Finnish high quality electronics R&D and manufacturing company. It was founded in 2012 to produce electronic computer access devices for people with special needs.

"Popz" is a little switch with adjustable sensitivity and supplied with a set of coloured stickers.

Born by the need to find and share places (bars, restaurants, hotels, parking, …) that are accessible to people with mobility difficulties. With the cooperation of its members are able to build a collaborative and social leisure and tourism accessible
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