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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.
Hope it is fine to chime in and link Kindelia. It is an ultra-minimalist, type-theory oriented take on Ethereum's concept I've working on since I left the Ethereum Foundation a few years ago. It can't have PoS by definition (there is no built in token), and it is based on Keccak too, so it may be a great alternative for Ethereum miners to move to.
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.