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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.
The cc crate (https://github.com/rust-lang/cc-rs) is widely used for compiling C code from Rust (often in a build.rs file for the purpose of wrapping a C library so that it can be used from Rust). However, I believe it generally does expect a C compiler to be present.
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.