UltraStar Deluxe is an open source karaoke program.
This game is (code) based on UltraStar which seems to have been inspired by Singstar. You can be up to 6 simultaneous players if you have 6 Microphones.
In contrast to SingStar, you can freely add any songs you like if you generate the melody information in a particular text format and supply the audio file. But there's a community in the web so you can find many song text files with google.
There exists a Linux edition (as it's open source) but you can also let the Windows version run on wine.
For more details and user comments, view the versions of this application
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