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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.
Vim, a plain text editor, from the command line. I use a macro language similar to LaTeX to do formatting. It's got some features that make it pretty nice for my needs, but most people would probably dislike it.
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Hence, a higher number means a more popular project.