Yep totally free and open source! This started out as a community effort to improve the G36 and will continue to be so, even as the original team as fallen off to just me. This is our way of giving back to this awesome community. 
@BurningJedi I did look at the Baron, even started getting some code down but the locked files make it very difficult to do; with not a huge return on investment (time). A lot of time would be spent just trying to reverse engineer to a point you could modify it. I decided it would be quicker to make my own plane, the Piper PA-46-500 TP Malibu Meridian
I am super glad you are all enjoying the G36 though!!