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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.
Other than SearX, Whoogle, StartPage, and all the other good stuff that people suggest, if you're on Linux and you use the terminal on daily basis, check out tuxi (available in the AUR as well)
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.