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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 that, Rethink is a proper network monitor and a (tcp/udp) firewall; while DDG is a browser bundling in DNS-based protection, from what I can tell. DDG is based on NetGuard, but they don't license that tech as FOSS but only under source-available license. Rethink is fully FOSS, and it was initially a fork on Intra, but it has diverged very much from Intra that it is no where near similar to its predecessor, anymore.
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.