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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.
Another good resource on intro crypto is @lvh's Crypto101 book: https://www.crypto101.io/
There are also some basic practical exercises (I don't believe the projects are technically related, but are in similar veins): https://cryptopals.com/
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.