Vocaluxe is described as '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' and is an app. There are four alternatives to Vocaluxe for a variety of platforms, including Mac, Windows, Linux, Android and Android Tablet apps. The best Vocaluxe alternative is UltraStar Deluxe, which is both free and Open Source. Other great apps like Vocaluxe are Performous, Youka and UltraStar Play.
The free and open source karaoke singing game UltraStar Deluxe, inspired by Sony SingStar™
UltraStar Deluxe is the most popular Windows, Mac & Linux alternative to Vocaluxe.
UltraStar Deluxe is the most popular Open Source & free alternative to Vocaluxe.
An open-source karaoke, band and dancing game where one or more players perform a song and the game scores their performances. Supports songs in UltraStar, Frets on Fire and StepMania formats. Microphones and instruments from SingStar, Guitar Hero and Rock Band as well as some...
UltraStar Play is a free and open source singing game. The game plays an audio file, displays lyrics, notes, and optionally a background video or image, while the players sing along to earn points.
UltraStar Play is the most popular Android & Android Tablet alternative to Vocaluxe.
Germany
EU
Stable, good documentation, big community and recently event further development. I use it on Linux together with PlayStation Singstar Microphones