Arno's Engram v1.0 ("Engram") layout is an optimized key layout for touch typing in English based on ergonomic considerations, with a protocol and software for creating new, optimized key layouts in other languages.

Arno's Spanish Engram layout is an optimized key layout for touch typing in Spanish based on ergonomic considerations, with a protocol and software for creating new, optimized key layouts in other languages.

Public code (Julia and Python3) for Chiara Gastaldi, Tilo Schwalger, Emanuela De Falco, Rodrigo Quian Quiroga, Wufram Gerstner, 2021, "When shared concept cells support associations: theory of overlapping memory engrams".