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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.
I don't know what ISO-26262 requires, but for IEC-61508 only requires "The language should be fully and unambiguously defined." - which I think Ferrocene has taken a decent stab at with https://spec.ferrocene.dev , and an accompanying ISO standard is not a hard requirement.
The standard is "what rustc does". The RFC on starting the work for a Rust Specification doesn't have the development of alternate implementations as one of its goals.
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.