There are 2 repositories under voice-applications topic.
🔈 The React for Voice and Chat: Build Apps for Alexa, Messenger, Instagram, the Web, and more
Record audio from a user's microphone and display a cool visualization.
🔈 A plugin for resuming conversations in the Open Source Voice Layer, Jovo (https://www.jovo.tech)
VOIS.AI is a web app to transcribe and examine the way a person talks:
Vehicle Safety Recalls, an experimental Alexa Skill project
Agent code for FREE course: https://achatbotguru.teachable.com/p/create-a-google-home-voice-app-in-under-30-minutes