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.
Speechmatics - The most accurate and inclusive speech-to-text API ever released.
Yack.net - Recorded and transcribed calls for team collaboration
Spok Speech Solutions - Spok Speech Solutions allows organization to process routine phone requests such as transfers, directory assistance, messaging, and paging without live operators, letting to manage call volumes, operator workloads, and keeping calls from dropping.