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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.
You can write your own minor mode, or just simply iterate through all headings with a given tag, and fold it in with-eval-after-load. You can check this code and see if it gives you an idea how to do it. Check part for tags; instead of setting invisible property for tag, you can fold your heading. Also match tags with specific keywords in them, not all tags as I do in regex.
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.