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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.
I specifically mentioned PacketTracer because I recently had to install it on a Fedora 37 machine, and sadly, alien does not work for it. It requires additional work to be installed. If I were on Arch, the AUR would have taken care of the entire process.
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.