2 layers

Relayctl hat
ReinierNel/relayctl
Simple shell scripts to control relays connected to your raspberry pi with a via CLI, cron like scheduler, external switches, REST API and Web-UI.
44 parts2MIT
KiCad boards from 2 GitHub repositories tagged “relay-controller”, the most starred first; open any of them in PCBKit.

ReinierNel/relayctl
Simple shell scripts to control relays connected to your raspberry pi with a via CLI, cron like scheduler, external switches, REST API and Web-UI.

aramder/orc
Open replacement controller board for surplus Motorola PMUN1046A relay boxes: ESP32-C3, CANopen control, 10 x 15 A channels. Independent project, not affiliated with Motorola Solutions.