Always there, no install needed. No word prediction, no dwell click, and it steals focus, so long typing sessions get tiring fast.

The Linux equivalent. Layouts are customisable and it has basic prediction, but it is tied to GNOME.

Minimal and genuinely free. Good if you need keys on screen and nothing else.

Linux, long-running project, works with switch access.

The old free standard for people who cannot use a physical keyboard. Still works, but development stopped years ago.

Worth a look if the built-in keyboard is not enough and you do not want to pay.

Another free option in this space.

Paid, feature-heavy, aimed as much at touchscreen kiosks as at accessibility.

Paid, long-established, with prediction and layout options.

Built for eye tracking, free and open source. The reference point if you control a computer with your eyes.

Not a keyboard at all: you write by steering through letters. Takes practice, very fast once it clicks.