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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.
Uniswap (if you're to believe resource allocation and price discovery aren't real use cases, then I'll let you tell to the stockmarket they aren't providing any service): https://uniswap.org/
LivePeer (well, that wasn't hard to find another one): https://livepeer.org/
https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1559.md has code giving the specification. The section specifically about calculating the base fee for a block is the bit that starts with the line
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.