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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.
oomd - developed by facebook and will be default in Fedora 34, it is part of Systemd 247 but still in experimental stage
nohang - I am using this one, it requires zero config by enable/start nohang-desktop.service
earlyoom - fedora uses this since v32, has simplest detection machanism
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.