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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.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Check it here
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vosk-api
Offline speech recognition API for Android, iOS, Raspberry Pi and servers with Python, Java, C# and Node
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.