Florence is an extensible scalable on-screen virtual keyboard for GNOME that stays out of your way when not needed. You need it if you can't use a real keyboard either because of a handicap, broken keyboard or tablet PC but you can use a pointing devide.
Boarded is a virtual on-screen keyboard for the X11 window system. It's intended to be used on mobile devices without a hardware keyboard. It allows you to design your own keyboard layouts, specifying key positioning/grouping and setting own colors.
pyneo-zadosk is a simple but highly configurable on-screen-keyboard. it uses libfakekey. it's written in python and is usable as stand-alone program or as module imported in a python app. it's output is based on GTK (currently python-gtk2 but will soon migrated to use gir).
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