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self-hosted
Discontinued [Legacy] Self-host your own Standard Notes server for end-to-end encrypted notes and files (by standardnotes)
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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 like standard notes. Intuitive web and app interfaces. They have advanced editors you can install that expand the features significantly. Probably not to onenote level, but far more options than I need hah.
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.