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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.
Also, since the default Compose file doesn't quite satisfy, see https://github.com/kragen/xcompose; they have defined a bunch of key sequences, which I use (with some extensions of my own — for example, I wanted a quick way to type a̋, and this wasn't built into the default sequences, since it uses a combining character).
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.