Just downloaded and used Xavion by Austin Meyer (developer of x plane) new app which is basically is an artificial intelligent co pilot.
This app is running engine-out FLIGHT SIMULATIONS internally as you fly, imagining an engine failure every single second, and running a simulated power-off glide to every runway at every airport in gliding range
When Xavion has found the runway that it believes is most likely to result in a safe engine-out landing, it builds a series of hoops from your current location to that runway, spiraling, circling, or extending AS NEEDED FOR THE HOOPS TO FOLLOW A CONSTANT DESCENT ANGLE THAT YOUR AIRPLANE SHOULD BE ABLE TO SUSTAIN WITHOUT POWER
Ran it through x plane and worked flawlessly. Bit pricey but worth the money if you ever have to use it for real.