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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.
There is also The Hitchhiker’s Guide to Online Anonymity which is more on the anonymity side of things (privacy not the same as anonymity but they can go hand in hand) https://anonymousplanet.org
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.