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jolikit
Java APIs to abstract away time (clocks, schedulers), simple 2D UIs (BWD), and a bit more, with default implementations
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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.
On old computers, you could go even faster by precomputing tiles representing little segments at various angles and then copying tiles. The trick here is to realize that you don't need many tiles to represent all the lines. The downside is that it's not quite accurate. But it's much faster. See an example here :
https://github.com/wiz21b/lowtech#the-3d
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Hence, a higher number means a more popular project.