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ldoc
LDoc is a LuaDoc-compatible documentation generator which can also process C extension source. Markdown may be optionally used to render comments, as well as integrated readme documentation and pretty-printed example files.
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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.
I'd say use ldoc https://github.com/lunarmodules/LDoc unless you really need to integrate with Sphinx.
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.