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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 applications are ZK-Rollups [1] which allow developers to move heavy computation off a blockchain. The blockchain receives the results and only validates proofs that they are valid. This is especially useful on Ethereum because its computational throughput is pretty low.
There's also ZCash [2], which is a cryptocurrency that lets you make untraceable transactions. This is in stark contrast to Bitcoin or Ethereum, where transaction information is available publicly to everyone. They have a series of blog posts [3] on the math that actually makes it work under the hood.
[1] https://ethereum.org/en/developers/docs/scaling/zk-rollups/
[2] https://z.cash
[3] https://electriccoin.co/blog/snark-explain/