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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.
Les Pas for Nextcloud can do almost everything you need now except for a auto-refresh photo stream monitoring a shared album. This feature is easy to add. After that, all you need is a android tablet.
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Hence, a higher number means a more popular project.