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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.
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orderbook
Port of www.quantcup.org (implementing a fast stock exchange matching engine) from C to Rust (by brettfazio)
Others have mentioned "Rust with Entirely Too Many Linked Lists" already, and as the name implies it covers the subject exhaustively.
it’s even written by the same person that wrote the Nomicon (the guide to the dark arts of unsafe)
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.