zlacker

>>wicket+(OP)
Where are the open source planes, trains, and automobiles? Medical equipment? Nuclear reactors? Open source cannot afford the quantity control/verification need for these domains. It’s the same for phones. At best you’re going to get an insecure mess.

>>7e+3c
https://makerplane.org/

(not a plane) https://www.youtube.com/@Ground-Effect/videos

Trains - not so hard, it's getting legit real track time that's the issue - and you can always 'cheat' with a Hi Rail Pickup Truck modification.

Automobiles - .. you are kidding, right? You've never built (or met a builder of) a road certified car, truck, or other vehicle?