Particle Life
hunar4321.github.io
Coloured dots that attract and repel start forming cells
Sandboxes & SimulatorsInstantFree, no sign-up
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Sandboxes & Simulators
The falling-sand classic, still updated after fifteen years
dan-ball.jp
Instant · Best on desktop
Free, no sign-up · online since 2007
Around fifty materials and tools sit on the palette: powder, water, fire, magma, ice, lasers, fans, bombs and small stickmen who react to all of it. Scenes can be uploaded when you are done, and there is a permanent gallery of what everybody else has built.
The stickmen are why people stay: they flee from fire, drown in water and can be handed weapons, which turns a physics toy into a small cruel theatre.
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Picked for a shared category and overlapping vibe, not for popularity.
hunar4321.github.io
Coloured dots that attract and repel start forming cells
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Two chemicals, two dials, and every pattern in nature