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Reticulum
The cryptography-based networking stack for building unstoppable networks with LoRa, Packet Radio, WiFi and everything in between.
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nym
Nym provides strong network-level privacy against sophisticated end-to-end attackers, and anonymous transactions using blinded, re-randomizable, decentralized credentials.
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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 neat thing I've figured about SimpleX's relay/proxy model (and also Nostr's) is that, since servers don't connect to each other, you can more easily run it on alternative networks such as https://reticulum.network. No bridging is necessary.
Nym mixnet could be something to check too