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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.
Nextcloud by default is just a cloud storage solution with a few extra features, but it has an app store with LOTS of plugins. I literally replaced like half of my services with it. Notes, password manager, bookmarks, news reader - you name it.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.