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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.
> Maybe a formal standardization
In practice, that's what pandoc is (and it includes definition lists as extensions: https://pandoc.org/MANUAL.html#definition-lists )
You also have commonmark (an actual standardization) from the same author: https://commonmark.org/ (but DLs are not part of commonmark yet)
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.