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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 Koler or Emerald as a dialer and you can go for OpenContacts as your contact app. For SMS you can try out Signal or QK sms. There’s YACB too, it’ll help you block spam calls
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.