> BeamNG.tech is an academia- and industry-oriented fork of BeamNG.drive. In content and features, it largely overlaps with BeamNG.drive, and offers additional functionality to support driver training simulators and the development of advanced driver-assistance systems (ADAS).
> […]
> BeamNG.tech is released under a mix of commercial and open-source licenses by BeamNG GmbH.
https://documentation.beamng.com/beamng_tech/
But it’s not clear from this page if they provide source code for the commercial parts of BeamNG.tech to customers or not. I guess you’d have to contact them and ask. Contact details are at the above linked page.
Nope. They simply started BeamNG as a commercial project, it was never a fork
https://www.beamng.com/threads/the-entire-history-of-beamng-...
And they use Torque which is licensed under MIT https://torque3d.org/ But that’s just the graphics not the physics enginge which haven’t been released. Rigs is using Ogre https://www.ogre3d.org/