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xcape
Linux utility to configure modifier keys to act as other keys when pressed and released on their own.
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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.
Don't know about i3, but you can achieve this in Linux/X11 using for example xcape: https://github.com/alols/xcape
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