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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.
Interesting, I'd not known of this RFC before.
Another example of a content-addressed data store could be OCI registries (more commonly known as container image registries). Using them to store arbitrary artefacts is quite well supported now: https://oras.land/
NOTE:
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Hence, a higher number means a more popular project.