What is this aircraft (Le Bourget airshow 1965)
It's a Nord 500 Cadet. From Wikipedia:


  A model kit presenting the concept was first shown at the Paris Air
  Show at Le Bourget in 1965. The aircraft was driven by two ducted
  fans, with three blades per fan, mounted on short wings that were able
  to pivot between providing vertical and horizontal thrust.
  
  Two prototypes were constructed, one making its first (tethered)
  flight in July 1968.


This early VTOL concept aircraft was designed by Nord Aviation (formely Potez), the French manufacturer. They were known for their military Transall and Noratlas seen everywhere in Western Europe in the 60s.

This aircraft is similar to CL-84 and XC-142 designed at the same period. The only one to have flown:


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Powered by Allison T63 (aka Model 250) turboshaft, 316 hp.
Maximum speed: 350 km/h.
Ceiling 4,101 ft.


The prototype used for static demonstration:


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Bonus: Trying to fly the prototype on Youtube.

A quite funny video I may say. With nearly all the attributes of my fellow countrymen of this era: beret, cigarette... just missing a baguette under the arm.