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Full local/open source lawnmower?
(lemm.ee)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
Ardumower is the one I've always intended to roll with. Eventually lol. The original nav method is a buried perimeter wire, but they do offer a GPS-RTK kit.