If you are one fan of Singstar, this is a great software for you. UltraStar Deluxe is a free and open source karaoke game inspired by the Singstar game. Party game mode is the same you can play in SingStar. Your goal is to win throughout the different tests and games purposed by the game: duel, blind sing, up to 5000, etc. Ultrastar Deluxe is more than a karaoke, give it a try, it's free. UltraStar Deluxe is a clone of UltraStar and its main news are the interface, updated and more elegant and new and attractive game modes. Play with up to six singers in UltraStar Deluxe, although you'll need a microphone for everyone.

UltraStar Deluxe Some Features:
1. Different modes of play: The same song can be played in 3 different modes of difficulty level. Besides mode solo or party mode.
2. Helps keep your username and your historical scores on every song.
3. To keep the ranking of the best singers who have used the game to your computer
4. Extra bonuses for each note rather difficult to reach
5. Graphically superior

The license of this software is Free, you can free download and free use this karaoke software.