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.
Florence stays out of your way when you don't need it: it appears on the screen only when you need it. A Timer-based auto-click input method is available to help disabled people having difficulties to click. The ramble mode is another efficient input method that can help.
Florence can be used on any desktop environment.
Source: Ardesia project