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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.
Ubiquiti doesn't have official support for it in the GUI, but you can do it in command line with a custom script called split-vpn. You can follow the instructions there.
Pihole on UDM
WireGuard on UDM. Note Ubiquiti includes the WireGuard kernel module since UDM 1.11.0 but you still need to download the WireGuard tools.
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.