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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.
https://github.com/Code52/carnac is similar if you're looking for something that doesn't require Java
Looks good! Keycastr is a similar project for macOS, I use it while streaming coding work. https://github.com/keycastr/keycastr
NOTE:
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Hence, a higher number means a more popular project.