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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.
N others with a mix of different versions of linux, windows and macOS. There are clients for Kolibri[1] and Android[2]
[1] - http://board.kolibrios.org/viewtopic.php?t=2544
[2] - https://github.com/symless/synergy-android-7
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.