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LibreQoS
A Quality of Experience and Smart Queue Management system for ISPs. Leverage CAKE to improve network responsiveness, enforce bandwidth plans, and reduce bufferbloat.
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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.
While cake was originally targetted at the low end of the bandwidth spectrum, it is now being used to handle thousands of people as an ISP 16 x86 core middlebox at over 10Gbit in libreqos.io. It also seems to be scaling decently in mikrotik.
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.