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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.
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vosk-api
Offline speech recognition API for Android, iOS, Raspberry Pi and servers with Python, Java, C# and Node
AFAIK, it is not a ready-to-use product. It could be used as recognition engine into apps. For example, you could try Voiceliner Github, that uses Vosk under the hood.
Check it here
There is an offline speech recognition API (https://github.com/alphacep/vosk-api) which could be used to build a Google Voice alternative.
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.