I am surprised nobody brought up yet Tesla's wireless "free energy" project, the one that was suppressed by evil companies... I love the guy, but not the fan club.

Rare-earth magnets are just strong magnets. They are just like any other magnet, except they can be built smaller to create the same field. The physical principle of energy conservation still apply.

And anything related to quantum physics will be restricted to small atomic scales and short periods of time, where indeed some weird energy fluctuations can happen. Of course, if someone manages to "pierce the space-time continuum" we can say anything.

The most "fringe" thing I do hold some hopes for is cold fusion. Not necessarily the exact same process advertised in the past, or being researched right now, maybe something new. And there is "hot" fusion of course, ITER is coming!

(EDIT: I wrote this before reading page 4 You can't take energy from a magnetic field, all you can do is move charges through the field to create E.M.F. . But the energy comes from the thing pushing the charges.)