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A DSP graph like VCV Rack, with wires and modules GUI would be amazing, so you can even create a Eurorack with 3d sound in the loop.
Bullet is still very much alive (I'm main author), we currently focus on simulation for deep learning (AI) and robotics, through PyBullet Python...
You can download a Windows executable and watch the TC Particles in the Museum of the Microstar - Oculus Rift Edition...