Cymatica – Chladni Plate Simulator
Renders 100k particles in real-time on iPhone with synced haptic feedback.

Nostalgic Fortran IV punch-card simulator—fun artifact, minimal practical use.
Computer science students, retrocomputing enthusiasts, and historians exploring computing legacies.
Esolangs.org · TetriNET · VintageComputer.net
Just for fun, I've only spent a few hours on it so far. What are everyone's punch card emulation needs?
Renders 100k particles in real-time on iPhone with synced haptic feedback.
Adds mass and density to meshes when most 3D tools only do visuals.
PlayStation Monster Rancher nostalgia rebooted with LLMs and URL-to-creature generation.
Live multiplayer craps table with full betting UI—but it's a game, not a tool.
UTM simulating itself where L3 won't execute its first step until the year 2070.
Four-agent match simulation with in-browser TTS commentary via WebGPU.