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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.
Seems like they are currently mostly working out documentation (which is very necessary for developers) and maintaining their current platforms like the web wallet. They've also released the source code for their app on Ledger Nano S/X here, but I'm guessing there's a bit more stuff to work out before it gets released officially.
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.