2 layers

Foxie clock nano
afoxinsocks/foxie-clock
A Nixie-like, retro, RGB LED, Arduino-powered clock
133 parts24GPL-3.0
KiCad boards from 1 GitHub repository tagged “redboard-nano”, the most starred first; open any of them in PCBKit.

afoxinsocks/foxie-clock
A Nixie-like, retro, RGB LED, Arduino-powered clock