Kerr black hole simulator: real horizon, ergosphere and ISCO physics, particle accretion disk, gravitational lensing, and a speculative 4D+ dimension-tower sequence past the singularity

Rotating magnetic black hole field simulator: frame-dragged field lines, polar lines, interior down to the singularity, 1 to 3 spinning holes

Binary black hole inspiral to merger played as a sine-tone gravitational wave, with a top-down wave view and Doppler for an in-plane observer

Browser for Spotify, SoundCloud and other streaming sites with a built-in full-range dynamic EQ on everything it plays. iOS app, sideload install