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Sandboxels
Sandboxels is an in-browser falling sand simulation game, with mechanics such as heat simulation, electricity, density, chemical reactions, fire, and over 500 unique elements to play with.
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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.
Good sandbox to mess around with, it's on Github too if you want the code for modding https://github.com/slweeb/sandboxels
NOTE:
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Hence, a higher number means a more popular project.