GSnap - With GSnap you can get an auto-tune effect.
Karaoke 5 - karaoke 5 software - Excellent Player and Creator of file Karaoke. Karaoke. Professional karaoke program. Free karaoke program.
Revoice Pro - Revoice Pro is an audio plugin used for vocal tuning, time correction and ADR.
UltraStar Deluxe - A free and open source karaoke game inspired by the Singstar™ game, runs on Windows, Linux and macOS.
Celemony Melodyne - Celemony Melodyne is the perfect quick and easy tool for all your tuning needs.
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!