Anti-Gravity Aircraft: electric aircraft
Thought Camera: In 1933, Tesla theorized about a device that could photograph thoughts. "I expect to photograph thoughts... In 1893, while engaged in certain investigations, I became convinced that a definite image formed in thought, must by reflex action, produce a corresponding image on the retina, which might be read by a suitable apparatus. This brought me to my system of television which I announced at that time...
Mechanical Oscillator: compresses air until the air is a liquid
Free Energy: Renewable electricity and heat tapped from the natural energy sources (not energy created from nothing)
Earthquake Machine: a pocket-sized device that could shake a house apart with building waves of energy.
Force Field: a Scalar field dome made of energy that will eventually be built big enough to protect a city from attack during wars
Death ray: destructive energy transmitter he claimed to have built - "when unavoidable... may be used to destroy property and life." --- Tesla, 1915.