Perpetual motion machines either produce more energy than is put into them or convert heat into other forms of energy without warming something cooler than the source of the heat. See http://en.wikipedia.org/wiki/Perpetual_motion_machine for a more detailed explanation.
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- Free Energy from a Collapsing Magnetic Field Fuelless engines and generators, built and tested by inventor Rick Harrison. Creative Science and Research sells plans and kits.
- All-Magnet Motors FreeEnergyNews.com's index of motor designs in which permanent magnets are the only motive force, featuring claims to working devices as well as ideas and flops.
- Free Energy and Perpetual Motion An account of Johann Bessler and his perpetual motion machine. Includes new theory on free energy machine, plus description of secret code, containing full details of construction of his machine - so far not deciphered.
- The Bessler Wheel Overview of a machine designed by Johann Bessler in 1712, that underwent numerous tests and passed rigorous inspections.
- Orffyreus Returns Historical research and information on Johann Bessler, aka Orffyreus, and his demonstration of a series of claimed perpetual motion wheels in the early 1700's.
- Flying Dutchman Projects Collection with ideas and experiments in the search of a device powered by permanent magnets only.