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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.
Simple Notes Pro from https://www.simplemobiletools.com Free and open source.
I've made a simple notes app that basically only lives in your notification panel, so it's quickly accessible. Unfortunately it doesn't sync with a desktop app and idk if I'll implement it anytime soon. If you're still interested, it's available on the PlayStore and it's source code on Github.
NOTE:
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Hence, a higher number means a more popular project.