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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 use Google docs for the most part. I've also used manuskript. It's free and runs on most platforms including Linux. https://www.theologeek.ch/manuskript/
NOTE:
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Hence, a higher number means a more popular project.