I thought perpetual motion was impossible.

I have read of scams involving people selling these plans.
 
I've also researched this topic on and off for 10 years now. I think there are some useful inventions, but without the insight of the people who invented them it may be extremely difficult for the inventions to be recreated.
 
It won't stop me trying ultimately, but at the moment I live off-grid and have a very limited power supply.
 
Some people who have worked on alternative energy sources include:
1) Nikola Tesla (Tesla's "Black Box")
2) Viktor Schauberger (Repulsine - which used the power of the vortex)
3) Paul Baumann of the Methernitha religious community in Switzerland (Testatika)
4) John Searl (magnetic levitation device)
 
Some sites which will have lots of information on these devices include:
http://keelynet.com/
http://www.frank.germano.com/index.htm
http://en.wikipedia.org/wiki/History_of_perpetual_motion_machines
 
I suggest you research the subject yourself and come to your own conclusions. It's a fascinating subject!

Thanks for this!