KaraWin is award-winning computer karaoke software for professional and home users. No needs for a powerful computer, works with any DirectX release.

http://www.karawin.fr/

vanBasco Software: MIDI and Karaoke Software for WindowsvanBasco Software provides MIDI and Karaoke Software for Windows.
www.vanbasco.com 
 

>> Midi Karaoke recorder software:

KarAll - Advanced Midi karaoke MP3 multiplayer for Windows - Free ...Features a multimedia midi karaoke MP3 player to transform computers into music machines.
www.karmidi.com 

Free MIDI and MP3 karaoke player
Turn your PC into an interactive karaoke machine with KaraFun free karaoke software for Windows. More than a karaoke player, KaraFun offers a complete solution for playing and creating your karaoke at home.
http://karafun.com/index_en.html

>> Midi Karaoke Creator:

MIDI Maestro is music software designed for use by amateur and professional music directors, conductors, and musical soloists in live musical theater and similar musical accompaniment situations.

http://www.mp3towav.org/MIDI-Maestro/

>> Karaoke Hardware system for home user:

KaraokeNow! Karaoke Equipment System
Total Resource for Karaoke music, songs, cds and karaoke machines, equipment,
systems, etc

http://www.karaokenow.com/karaoke-system/