the wheel
bicycles
sewing machines
hand tools
musical instruments
open radio bands like CB and FRS
ham radio (licensing exists but not corporate control)
meshtastic
blacksmithing
glass blowing
garden tools
propane camp stoves
mechanical clocks and watches
open source software (the ecosystem overall, not specific projects)
email as a protocol
RSS
SMS as a protocol
USB storage devices
SIP based VOIP
mesh networking gear
3d printers in the hobby market
drones under 250g
amateur astronomy gear
microcontrollers like Arduino
LED strips and controllers
bicycles
composting tech
sourdough starter culture tech (yes really)