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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 put normal Android version here https://github.com/karino2/PngNote/releases/tag/0.2 with the name PngNote_NonBoox_v0_2.apk.
I think more than half of the user prefer pdf. I'm just minority for this preference. As you know, pdf+vector note app is totally different app. But I think it also possible to create pdf based note taking app by forking some open-sourced such app (once I used Quill and it is open source, forking like this app and support raw rendering might be good candidate).
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.