I saw this on line somewhere a few years ago and I thought it was very cool. It was a home made log splitter that used an old coil spring and a heavy wedge. It was really easy to operate and obviously used no fuel or made any screaming noise. It was balanced so as to use very little effort to split any size log.
It would be easy to make for a local welder and lots cheaper than a motorized one.
https://www.youtube.com/watch?v=R3VMhfIsfm0