Torque3D

Well, there's a lot - a few I happen to be familiar with: Maxima: https://maxima.sourceforge.io/ Axiom: http://www.axiom-developer.org/ OpenCascade: https://dev.opencascade.org/ BRL-CAD: https://brlcad.org/ GRASS: https://grass.osgeo.org/about/history/ illumos: https://illumos.org/ Docker: https://github.com/docker Torque: https://github.com/GarageGames/Torque3D

Oh man this brings me back (and I'm probably not old enough to be allowed to say that)! My first real start with game development, and well serious coding, was using the Torque Game Engine, which is the Tribes II engine. I saved up my money to buy a license for Torque 1.5 (it was $150 I believe and I was in high school), because at the time it was the only game engine which 1) Had source code access, 2) Wasn't insanely expensive for a hobbyist, 3) Was fully functional by itself. The engine overall was pretty amazing, of course it had it's warts. I still remember the networking code pretty well. I played with the physics part of the engine quite a lot and rewrote and modded it a few times. I usually wanted networking in my experiments, so I learned a lot about that part of the engine as well. I don't play with gamedev anymore, and probably