iSing Karaoke - iSing Karaoke is free to use the Karaoke app that offers free access to hundreds of songs.
Alexa Skill Kit - Effortless Alexa Skill development with AWS Lambda
Sing! Karaoke by Smule - Karaoke with your favorite celebrity singers
Voiceflow - Build voice apps in your browser without coding
Singa - Singa is the best way to sing karaoke on mobile or tablet.
Jovo - 🗣 Build cross-platform apps for Alexa and Google Home