Just Press Record - A simple, professional audio recorder
UltraStar Deluxe - A free and open source karaoke game inspired by the Singstar™ game, runs on Windows, Linux and macOS.
Voicegram by Sayspring - Record and share conversations with Alexa from the browser
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!
Yousician - Learn to play music at home, at your own pace
OpenKJ - Open source cross platform karaoke hosting software