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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.
ED Discovery has a hardware store worth of other functionality. But really needs a second monitor to get the most out of it. https://github.com/EDDiscovery/EDDiscovery/wiki
ED Scout is much more compact and less featured, but has the ability to display output to a tablet or phone, in case you don't have a second monitor. https://github.com/joncage/ed-scout
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.