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org-freeplane
DEPRECATED: see ox-freeplane.git (fixes for org-exp.el and org-freemind.el for Freeplane)
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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.
Org-mode is -before almost everything else- a great outliner. So collapsing/expanding (showing more or less), moving, adding, editing, rearranging things is what it does out of the box... among many others, like setting states, adding tags, dates (timestamps, schedule, deadlines, etc.), lists (with checks if you like), automatic timings, properties/metadata that can be used in calculations, tables (as spreadsheets), querying your files and making things with the results (from calendars to tables), exporting, transforming the same data into multiples visualization (like headings with metadata into tables), exporting to many formats, and more. Even making networks from links as the org-roam server that we talked before or creating mind maps like the great Alphapapa's https://github.com/alphapapa/org-graph-view . :)
Someone got you covered: https://github.com/fnatter/org-freeplane So maybe you can use both without investing more than 5 minutes. ;)