Munsell
https://en.wikipedia.org/wiki/Munsell_color_system
OSA UCS
https://en.wikipedia.org/wiki/OSA-UCS
CIE LAB
https://en.wikipedia.org/wiki/CIELAB_color_space
Jzazbz
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-13-15131
a digital contribution to color practice