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The-Powder-Toy
Written in C++ and using SDL, The Powder Toy is a desktop version of the classic 'falling sand' physics sandbox, it simulates air pressure and velocity as well as heat.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Here it is. The important differences are getting the canvas context in setup() (sketch.js lines 24 & 25 in that commit), and then using it instead of p5's methods to draw the rectangles in the Particle show() method (lines 20-24 in Particle.js in that commit). All that's pretty much still there in the most recent commit too.
So it's the powder toy? https://powdertoy.co.uk/