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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.
ZBar - ZBar is a widely used open-source software that supports scanning QR codes with a webcam on Windows 10. https://zbar.sourceforge.net/
NOTE:
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Hence, a higher number means a more popular project.