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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.
To follow up on this, here's the list of all keys. There's a whole bunch of non-standard keys that you probably don't have on your main keyboard, like Browser_Refresh and Launch_Mail. There's also projects like AHKHID (which admittedly, I haven't figured out how to use) that allow you to have hotkeys on a per-device basis, so you could have an additional standard keyboard exclusively for hotkeys.
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.