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Dark-Basic-Pro
Dark Basic Pro is an open source BASIC programming language for creating Windows applications and games
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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.
DarkBASIC comes to mind, that's from around 2000 and the creators open sourced it a few years ago so you can actually get hold of it.
NOTE:
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Hence, a higher number means a more popular project.