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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.
If you just want folding then you can use emacs' built-in outline mode. And there are very easy ways to jump around a "modular" or multi-file config as well. I use both of these tools in my own config. I also like that I can easily load just small parts of my config via command line args, and of course that I don't need to worry about bootstrapping org-mode to get things running.
NOTE:
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Hence, a higher number means a more popular project.