S21RC Digital Interface - https://s21rc.net/s21rc-digital-interface-rev-3-0-ham-radio-computer/

All In One Cable - https://github.com/skuep/AIOC

Universal Radio Controller - https://g1lro.uk/ - Based on the AIOC Project

2M0IIG’s board - https://github.com/mpentler/k0rx-interface-pcb

Signalink USB

RIGblaster

Digirig - https://digirig.net/