Here, are 5 free on screen keyboard software which makes a virtual keyboard appear on your computer screen. These on screen keyboard software basically display a virtual keyboard on which you can type-in using mouse. These on screen keyboard are extremely helpful for physically disabled users who can’t type on the actual keyboard. As the physically disabled users simply need to use their computer mouse for typing on this virtual keyboard. Some of these on screen keyboard software even allow you to adjust the transparency level, size, etc of the virtual keyboard that appears on the computer screen.