UltraStar Deluxe - A free and open source karaoke game inspired by the Singstar™ game, runs on Windows, Linux and macOS.
Karaoke Mugen - Video & Movies and Audio & Music
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!
KaraokeParty.com - Sing karaoke online and get a score based on your performance.
Singa - Singa is the best way to sing karaoke on mobile or tablet.
Vocaluxe - Vocaluxe is a free and open source singing game, inspired by Ultrastar (Deluxe) project. It allows up to six players to sing along with music using microphones in order to score points, depending on the pitch of the voice and the rhythm of singing.