Finding a virtual keyboard that works good on any of those is a hard thing to find. I failed at finding it.So, how about a keyboard that works inside Firefox as a plugin ? Thats exactly what I imagined when i started on this project.

Here is a working plugin in my language and set for my specific needs.
FxKeyboard 1.1 – 3kb
fxkeyboard 1.1 English – Due to demand, a slightly more English version ( same layout as with the last one but English buttons, if someone makes a mockup for a real usable English layout, i will be glad to add it.)

GNU/GPL as usual, but i would like it if you ask for my permission before you use it in public accessible areas. If you are doing a kiosk system, you might also be interested in keeping firefox on the homepage using FxGrounded.

If you need customization, have a idea worth sharing or anything else, write me a email or comment this post.