Download, unzip, run the  .exe file.
Exit demos with alt + F4.
Don't tell your friends, keep it a secret.
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hoverboard_demo.zip    Use left and right arrows, or a and d, for extra carve.

pbc_demo.zip

pbc_manual.pdf

Link to Unity forum thread.
Available on the Asset store, follow this link.
Link to a long video interview about this asset.
The mouse sensitivity is set quite low in the PBC demo. Easily adjustable in the asset. 

true_bullet_demo.zip

true_bullet_103_manual.pdf