Jasper - Jasper is an open source platform for developing always-on, voice-controlled applications.
Deepgram - Search engine for speech
Hidden Markov Model Toolkit - Hidden Markov Model Toolkit (HTK) is a portable toolkit used for speech recognition research, speech synthesis, character recognition and DNA sequencing.
Cassette - Transcribe, record & share conversations
Speechmatics - The most accurate and inclusive speech-to-text API ever released.
Sensory - Sensory provides accurate, low-cost embedded voice and biometric AI. Sensory’s technologies have shipped in over a billion units of consumer products.