CanonCat (1987) / Jef Raskin

A computer system with text-based interface and some ideosyncratic tweaks developed by Raskin aimed at high efficiency and convenience. He elaborates on his approach in his „Humane Interface“ book. Most notably the LEAP function, a way to quickly navigate around documents, that also introduced the dedicated LEAP buttons on the CanonCat’s keyboard.

CanonCat demo video
Promo video for the LEAP technology