UltraStar Deluxe - A free and open source karaoke game inspired by the Singstar™ game, runs on Windows, Linux and macOS.
KaraFun - KaraFun is the best online karaoke. Over 35,000 karaoke songs, with studio quality, at home or on the go. Regular updates. Free demo!
Karaoke Mugen - Video & Movies and Audio & Music
Yokee - Karaoke to YouTube videos
Sing! Karaoke by Smule - Karaoke with your favorite celebrity singers
Smule - Smule is the social singing app that lets you enjoy millions of karaoke songs. Connect with your friends from all over the world or sing with top artists!