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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.
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There's also an open hardware version of the Kinesis advantage. https://github.com/adereth/dactyl-keyboard
It's completely open source as well: https://github.com/dasher-project/dasher
NOTE:
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Hence, a higher number means a more popular project.