OpenSimpleLidar
Seems... dangerous? Project states it uses "3mw 780nm Infrared IR Diode Laser". 3mw is enough to damage your eye if you don't blink or turn away. Since it's infrared, you won't blink, or possible even notice anything (there are no pain receptors in the retina) until it's too late.Wikipedia list "780–1400 nm (near-IR) - Pathological effect: 	cataract, retinal burn"