Cryptogon has a link to a Brazilian free energy generation device. I've got no idea if it works (though I always enjoy the universal popularity of perpetual motion machines) but I guess if it doesn't it could always serve as a piece of industrial art - The RAR Energia Gravity Motor.
When one follows “free energy” inventors, a lot of times, the path leads to madness.
The machines in question (that don’t work, by the way) are usually very small—table top scale—bicycle tires and JB Weld sorts of things.
Knowing all of this, I nearly fell out of my chair when I looked at what RAR Energia has built in Brazil. That thing is about two stories tall, and must have cost a minimum of hundreds of thousands of dollars to build.