meSing.js is a JavaScript singing synthesis library that uses the Web Audio API's DSP capabilities in conjunction with the meSpeak.js speech synthesis library to provide a vocal synthesizer for the web.
JsSpeechRecognizer is a javascript based speech recognizer. It allows you to train words or phrases to be recognized, and then record new audio to match to these words or phrases.
Artyom.js is a voice recognition javascript library. You can make awesome stuff with Google Chrome speech synthesis and speech recognition. You can build your own Siri, Google Now or Cortana within your web application.
JuliusJS is a speech recognition library for the web.It actively listens to the user to transcribe what they are saying through a callback.