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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.
Looking at the repo, it appears to be based on a model trained using K2/icefall (https://github.com/k2-fsa/icefall; K2 is next generation of Kaldi). It claims to be based on a LSTM Transducer model trained on the Librispeech dataset as the base, and further "trained with some extra data". No further information is provided.
Librispeech is CC-BY 4.0 licensed (see http://www.openslr.org/12/).
There are various size options for the models. The choice of which you use trades off accuracy for higher performance.
There is also a C++ re-implementation that performs well and can definitely transcribe in realtime on many machines: https://github.com/ggerganov/whisper.cpp