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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 evolution the gnome email client. There is also calcurse, which is a ncurses based calendar with "experimental CalDAV support", I havent used it for too long, as I need an email application anyways and it's alright.
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