Keyboard use:
Ergodox keyboard: a split, fully programmable keyboard with matrix layout and a thumb cluster.
Dodohand: a promising project to revive the Datahand which is a keyboard minimizing finger movement.
Pentadactyl: a Firefox extension to fully control the browser via the keyboard.
Colemak: an optimized keyboard layout.
Asetniop: a method for chorded input available on various devices.
Red tinted glasses.