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Tor
Discontinued Tor protects your privacy on the Internet by hiding the connection between your Internet address and the services you use. (This is *not* the official repository.) (by katmagic)
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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.
One of the solutions I've seen mentioned is effectively the TOR network on the blockchain. While this type of solution would not guarantee anonymity it would at least make it more difficult for people to "follow the money" through the network just as the TOR browser makes it difficult for the FBI to follow your web traffic.
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.