I know you posted that it isn't ATF, but.....

You have oil on the dipstick, yet there is oil underneath the vehicle pouring out, and you have no drive.

Sure sounds like an ATF leak. There are transmission cooler lines running to the front, that is where I would look for a leak.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue