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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 UHC Haskell compiler was written in a composable, or at least extensible, way using attribute grammars.
Take a look at Wyvern.
But I want to also allow languages like Ink and Markdown that are plaintext-with-exceptions. And sometimes meaningful whitespace is nice.
Other projects not mentioned yet in this area are GraalVM and unseemly by Paul Stansifer https://github.com/paulstansifer/unseemly
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.