The current version still runs on an old closed source build of the Torque3D engine, but with the somewhat recent move to MIT licensing, it has now become possible to go fully open-source.
According to the author:
So lets give him the help he needs ;)All I need is about a month's time and some cash to make it happen.
The only not so great part of it is that the Linux port of the Torque3D MIT engine is not yet available. Several people are slowly working on it, but after a failed attempt to crowd-fund it, there seems to have been some setbacks.
But optimistically speaking, this could give it the needed push to also motivate the finalization of a working Linux port.