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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've personally only used Netmaker, so I can't speak to the specific features and performance of Headscale. However, I've had mostly a positive experience with Netmaker so far. It's been mostly reliable and easy to use, and but sometimes its been hard to know why some things are not working.
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.