Im into fixing just about anything old (and on occasion new). More of a hobby now but borne of necessity back in my quasi-homeless years.
Cars, Boats, Motors (electric and gas). fans, bicycles. Whatever gets left at the curb that looks interesting.
Latest revival was a 40 year old rototiller that was left in the middle of a field. Almost done re-building the original engine but to use I have a curb found 3 hp that only needed fresh gas and an oil change. So far it has prepped about 7 gardens in my neighborhood and helped me level out my old compost pile into a manageable piece of ground again.