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Re:WebGL Fluid Experiment (2014) by thedrbrian on Wednesday August 05, 2020 @04:33PM (#24065257)
There’s also the stand alone Powder Toy which has more powders and saves and such

https://powdertoy.co.uk/

Re:WebGL Fluid Experiment (2014) by snazz on Wednesday August 05, 2020 @04:58PM (#24065528)
And the modern web-based incarnation Sandspiel, which was extremely popular on HN a while ago: https://news.ycombinator.com/item?id=18696291