Guix

Florence is an extensible scalable virtual keyboard for X11. It is useful for people who can't use a real hardware keyboard (for example for people with disabilities), but you must be able to use a pointing device (as a mouse, a trackball, a touchscreen or opengazer).

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 to click.