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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'm using Posidon launcher and happy with it, it's on F-Droid but they released a new version a couple days ago and it's not on F-Droid yet, you can find it on Github. Nova and Posidon are very different but I was also a Nova user and I didn't felt like I'm missing something.
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.