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Play
Free and open source singing game with song editor for desktop, mobile, and smart TV (by UltraStar-Deluxe)
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https://github.com/UltraStar-Deluxe/Play Just looked up "open source karaoke software" This seems to be the top hit.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.