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docassemble
A free, open-source expert system for guided interviews and document assembly, based on Python, YAML, and Markdown.
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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.
Check out https://docassemble.org/
I don't know if it's popular enough to be used on your side of the pond, but it's a tool used by lawyers that's scriptable and extensible with code.
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.