I, with one undergrad course in Modern Physics, think these Free Energy/Anti-gravity knobs might be onto something. They just discredit themselves with bad vocabulary. The Lifters are producing a thrust, and I believe they have shown to produce a thrust in a vacuum chamber (Purdue?). But to claim Anti-gravity is premeture or worse, sensationalism. Propellentless propulsion is a holy grail in it's own right, it doesn't need the hype.
The free-energy guys are claiming to extract energy from some sort of background radiation flux, it's no more free than solar or hydro-electric. Yet again, they sell it as a something for nothing scheme.
Yes.
Propellentless propulsion is a holy grail in it's own right, it doesn't need the hype.
Claiming to break Newton's third law constitutes hype, IMHO.
The free-energy guys are claiming to extract energy from some sort of background radiation flux,
Claiming in effect to break the laws of thermodynamics constitutes hype, too. You can have all the energy in the universe, but if you can't get it to flow from a hot reservoir to a cold one, you can't use it to do work. Background energies are almost by definition "cold".
Related to zero-point energy. Energy is useless, work is what counts. Zero-point energy and free-energy can't do work. There is no free lunch.