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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.
You can sideload, but it's annoyingly difficult. Personally I put up with it anyway. For free, it's a max of two apps and you have to "resign" it once a week. This is can be made more seamless by having it autosign using a PC, but it's still a barrier. There's a whole subreddit for it r/sideloaded. I currently sideload cracked Spotify and uYou+ which adds a bunch of stuff like background play, downloading, AMOLED dark, etc.
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.