I’ve been following the project for a year now and Clemens Elflein has actually managed to get the topic off the ground professionally. Recently, his kit is available, with which you can upgrade a cheap Yardforce robotic mower to GPS support. This eliminates the need to lay boundary wires.
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
I’ve been following this for a while because even though I have a small lawn, lawncare is easily one of my least favorite activities.
I also would suggest thi8s gets reposted to other tool/gardening/homeowner related subs too.