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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 use the unofficial Android app, but a lot of people have reported their accounts getting suspended. The safest options now would be to wait for Clubhouse to release an official app (ETA 2 months) or buy an old iPhone for $90, which might or might not be worth it depending on what you use the app for.
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.