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swift-docc
Documentation compiler that produces rich API reference documentation and interactive tutorials for your Swift framework or package.
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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.
A static converter is being worked on by the community. I haven't tried it out though: https://github.com/DoccZz/docc2html
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.